Cognitive behavioral therapy (CBT) is a psycho-social intervention^[1][2] that aims to improve mental health.^[3] CBT focuses on challenging and changing unhelpful cognitive distortions (e.g. thoughts, beliefs, and attitudes) and behaviors, improving emotional regulation,^[2][4] and the development of personal coping strategies that target solving current problems. Originally, it was designed to treat depression, but its uses have been expanded to include treatment of a number of mental health conditions, including anxiety.^[5][6] CBT includes a number of cognitive or behaviour psychotherapies that treat defined psychopathologies using evidence-based techniques and strategies.^[7][8][9]

The CBT model is based on the combination of the basic principles from behavioral and cognitive psychology.^[2] It is different from historical approaches to psychotherapy, such as the psychoanalytic approach where the therapist looks for the unconscious meaning behind the behaviors and then formulates a diagnosis. Instead, CBT is a "problem-focused" and "action-oriented" form of therapy, meaning it is used to treat specific problems related to a diagnosed mental disorder. The therapist's role is to assist the client in finding and practicing effective strategies to address the identified goals and decrease symptoms of the disorder.^[10] CBT is based on the belief that thought distortions and maladaptive behaviors play a role in the development and maintenance of psychological disorders,^[3] and that symptoms and associated distress can be reduced by teaching new information-processing skills and coping mechanisms.^[1][10][11]

When compared to psychoactive medications, review studies have found CBT alone to be as effective for treating less severe forms of depression^[12] and anxiety, posttraumatic stress disorder (PTSD), tics,^[13] substance abuse, eating disorders and borderline personality disorder. It is often recommended in combination with medications for treating other conditions, such as severe obsessive compulsive disorder (OCD) and major depressive disorder, opioid use disorder, bipolar disorder and psychotic disorders. In addition, CBT is recommended as the first line of treatment for majority of psychological disorders in children and adolescents, including aggression and conduct disorder.^[1][4] Researchers have found that other bona fide therapeutic interventions were equally effective for treating certain conditions in adults.^[14][15] Along with interpersonal psychotherapy (IPT), CBT is recommended in treatment guidelines as a psychosocial treatment of choice,^[1][16] and CBT and IPT are the only psychosocial interventions that psychiatry residents are mandated to be trained in.^[1]

Mainstream cognitive behavioral therapy assumes that changing maladaptive thinking leads to change in behavior and affect,^[17] but recent variants emphasize changes in one's relationship to maladaptive thinking rather than changes in thinking itself.^[18] The goal of cognitive behavioral therapy is not to diagnose a person with a particular disease, but to look at the person as a whole and decide what can be altered.

Therapists or computer-based programs use CBT techniques to help people challenge their patterns and beliefs and replace errors in thinking, known as cognitive distortions, such as "overgeneralizing, magnifying negatives, minimizing positives and catastrophizing" with "more realistic and effective thoughts, thus decreasing emotional distress and self-defeating behavior".^[17] Cognitive distortions can be either a pseudo-discrimination belief or an over-generalization of something.^[19] CBT techniques may also be used to help individuals take a more open, mindful, and aware posture toward cognitive distortions so as to diminish their impact.^[18]

Mainstream CBT helps individuals replace "maladaptive... coping skills, cognitions, emotions and behaviors with more adaptive ones",^[20] by challenging an individual's way of thinking and the way that they react to certain habits or behaviors,^[21] but there is still controversy about the degree to which these traditional cognitive elements account for the effects seen with CBT over and above the earlier behavioral elements such as exposure and skills training.^[22]

CBT can be seen as having six phases:^[20]

These steps are based on a system created by Kanfer and Saslow.^[23] After identifying the behaviors that need changing, whether they be in excess or deficit, and treatment has occurred, the psychologist must identify whether or not the intervention succeeded. For example, "If the goal was to decrease the behavior, then there should be a decrease relative to the baseline. If the critical behavior remains at or above the baseline, then the intervention has failed."^[23]

The steps in the assessment phase include:

The re-conceptualization phase makes up much of the "cognitive" portion of CBT.^[20] A summary of modern CBT approaches is given by Hofmann.^[25]

There are different protocols for delivering cognitive behavioral therapy, with important similarities among them.^[26] Use of the term CBT may refer to different interventions, including "self-instructions (e.g. distraction, imagery, motivational self-talk), relaxation and/or biofeedback, development of adaptive coping strategies (e.g. minimizing negative or self-defeating thoughts), changing maladaptive beliefs about pain, and goal setting".^[20] Treatment is sometimes manualized, with brief, direct, and time-limited treatments for individual psychological disorders that are specific technique-driven. CBT is used in both individual and group settings, and the techniques are often adapted for self-help applications. Some clinicians and researchers are cognitively oriented (e.g. cognitive restructuring), while others are more behaviorally oriented (e.g. in vivo exposure therapy). Interventions such as imaginal exposure therapy combine both approaches.^[27][28]

CBT may be delivered in conjunction with a variety of diverse but related techniques such as exposure therapy, stress inoculation, cognitive processing therapy, cognitive therapy, relaxation training, dialectical behavior therapy, and acceptance and commitment therapy.^[29][30] Some practitioners promote a form of mindful cognitive therapy which includes a greater emphasis on self-awareness as part of the therapeutic process.^[31]

In adults, CBT has been shown to have effectiveness and a role in the treatment plans for anxiety disorders,^[32][33] body dysmorphic disorder,^[34] depression,^[35][36] eating disorders,^[37] chronic low back pain,^[20] personality disorders,^[38] psychosis,^[39] schizophrenia,^[40] substance use disorders,^[41] in the adjustment, depression, and anxiety associated with fibromyalgia,^[17] and with post-spinal cord injuries.^[42]

In children or adolescents, CBT is an effective part of treatment plans for anxiety disorders,^[43] body dysmorphic disorder,^[44] depression and suicidality,^[45] eating disorders and obesity,^[46] obsessive–compulsive disorder (OCD),^[47] and posttraumatic stress disorder,^[48] as well as tic disorders, trichotillomania, and other repetitive behavior disorders.^[49] CBT-SP, an adaptation of CBT for suicide prevention (SP), was specifically designed for treating youths who are severely depressed and who have recently attempted suicide within the past 90 days, and was found to be effective, feasible, and acceptable.^[50] CBT has also been shown to effective for posttraumatic stress disorder in very young children (3 to 6 years of age).^[51] Reviews found "low quality" evidence that CBT may be more effective than other psychotherapies in reducing symptoms of posttraumatic stress disorder in children and adolescents.^[52] CBT has also been applied to a variety of childhood disorders,^[53] including depressive disorders and various anxiety disorders.

CBT combined with hypnosis and distraction reduces self-reported pain in children.^[54]

Cochrane reviews have found no evidence that CBT is effective for tinnitus, although there appears to be an effect on management of associated depression and quality of life in this condition.^[55] Other recent Cochrane Reviews found no convincing evidence that CBT training helps foster care providers manage difficult behaviors in the youths under their care,^[56] nor was it helpful in treating people who abuse their intimate partners.^[57]

According to a 2004 review by INSERM of three methods, cognitive behavioral therapy was either "proven" or "presumed" to be an effective therapy on several specific mental disorders.^[58] According to the study, CBT was effective at treating schizophrenia, depression, bipolar disorder, panic disorder, post-traumatic stress, anxiety disorders, bulimia, anorexia, personality disorders and alcohol dependency.^[58]

Some meta-analyses find CBT more effective than psychodynamic therapy and equal to other therapies in treating anxiety and depression.^[59][60]

Computerized CBT (CCBT) has been proven to be effective by randomized controlled and other trials in treating depression and anxiety disorders,^{[33][36][61][62][63][64]} including children,^[65] as well as insomnia.^[66] Some research has found similar effectiveness to an intervention of informational websites and weekly telephone calls.^[67][68] CCBT was found to be equally effective as face-to-face CBT in adolescent anxiety^[69] and insomnia.^[66]

Criticism of CBT sometimes focuses on implementations (such as the UK IAPT) which may result initially in low quality therapy being offered by poorly trained practitioners.^[70][71] However, evidence supports the effectiveness of CBT for anxiety and depression.^[63] Acceptance and commitment therapy (ACT) is a specialist branch of CBT (sometimes referred to as contextual CBT^[72]). ACT uses mindfulness and acceptance interventions and has been found to have a greater longevity in therapeutic outcomes. In a study with anxiety, CBT and ACT improved similarly across all outcomes from pre-to post-treatment. However, during a 12-month follow-up, ACT proved to be more effective, showing that it is a highly viable lasting treatment model for anxiety disorders.^[73]

Evidence suggests that the addition of hypnotherapy as an adjunct to CBT improves treatment efficacy for a variety of clinical issues.^[74][75][76]

CBT has been applied in both clinical and non-clinical environments to treat disorders such as personality conditions and behavioral problems.^[77] A systematic review of CBT in depression and anxiety disorders concluded that "CBT delivered in primary care, especially including computer- or Internet-based self-help programs, is potentially more effective than usual care and could be delivered effectively by primary care therapists."^[61]

Emerging evidence suggests a possible role for CBT in the treatment of attention deficit hyperactivity disorder (ADHD);^[78] hypochondriasis;^[79] coping with the impact of multiple sclerosis;^[80] sleep disturbances related to aging;^[81] dysmenorrhea;^[82] and bipolar disorder,^[83] but more study is needed and results should be interpreted with caution. CBT can have a therapeutic effects on easing symptoms of anxiety and depression in people with Alzheimer's disease.^[84] CBT has been studied as an aid in the treatment of anxiety associated with stuttering. Initial studies have shown CBT to be effective in reducing social anxiety in adults who stutter,^[85] but not in reducing stuttering frequency.^[86][87]

In the case of people with metastatic breast cancer, data is limited but CBT and other psychosocial interventions might help with psychological outcomes and pain management.^[88]

There is some evidence that CBT is superior in the long-term to benzodiazepines and the nonbenzodiazepines in the treatment and management of insomnia.^[89] CBT has been shown to be moderately effective for treating chronic fatigue syndrome.^[90]

In the United Kingdom, the National Institute for Health and Care Excellence (NICE) recommends CBT in the treatment plans for a number of mental health difficulties, including posttraumatic stress disorder, obsessive–compulsive disorder (OCD), bulimia nervosa, and clinical depression.^[91]

Cognitive behavioral therapy has been shown as an effective treatment for clinical depression.^[35] The American Psychiatric Association Practice Guidelines (April 2000) indicated that, among psychotherapeutic approaches, cognitive behavioral therapy and interpersonal psychotherapy had the best-documented efficacy for treatment of major depressive disorder.^[92] One etiological theory of depression is Aaron T. Beck's cognitive theory of depression. His theory states that depressed people think the way they do because their thinking is biased towards negative interpretations. According to this theory, depressed people acquire a negative schema of the world in childhood and adolescence as an effect of stressful life events, and the negative schema is activated later in life when the person encounters similar situations.^[93]

Beck also described a negative cognitive triad. The cognitive triad is made up of the depressed individual's negative evaluations of themselves, the world, and the future. Beck suggested that these negative evaluations derive from the negative schemata and cognitive biases of the person. According to this theory, depressed people have views such as "I never do a good job", "It is impossible to have a good day", and "things will never get better". A negative schema helps give rise to the cognitive bias, and the cognitive bias helps fuel the negative schema. Beck further proposed that depressed people often have the following cognitive biases: arbitrary inference, selective abstraction, over-generalization, magnification, and minimization. These cognitive biases are quick to make negative, generalized, and personal inferences of the self, thus fueling the negative schema.^[93]

A 2001 meta-analysis comparing CBT and psychodynamic psychotherapy suggested the approaches were equally effective in the short term.^[94] In contrast, meta-analyses of larger trials of different psychotherapeutic treatments that CBT, interpersonal therapy, and problem-solving therapy for depression outperform psychodynamic psychotherapy and behavioral activation in terms of robustness of effects.^[16]

CBT has been shown to be effective in the treatment of adults with anxiety disorders.^[95]

A basic concept in some CBT treatments used in anxiety disorders is in vivo exposure. The term refers to the direct confrontation of feared objects, activities, or situations by a patient. For example, a woman with PTSD who fears the location where she was assaulted may be assisted by her therapist in going to that location and directly confronting those fears.^[96] Likewise, a person with social anxiety disorder who fears public speaking may be instructed to directly confront those fears by giving a speech.^[97] This "two-factor" model is often credited to O. Hobart Mowrer.^[98] Through exposure to the stimulus, this harmful conditioning can be "unlearned" (referred to as extinction and habituation). Studies have provided evidence that when examining animals and humans that glucocorticoids may possibly lead to a more successful extinction learning during exposure therapy. For instance, glucocorticoids can prevent aversive learning episodes from being retrieved and heighten reinforcement of memory traces creating a non-fearful reaction in feared situations. A combination of glucocorticoids and exposure therapy may be a better improved treatment for treating patients with anxiety disorders.^[99]

A 2015 Cochrane review also found that CBT for symptomatic management of non-specific chest pain is probably effective in the short term. However, the findings were limited by small trials and the evidence was considered of questionable quality.^[100]

There is limited evidence of effectiveness for CBT in bipolar disorder^[83][101] and severe depression.^[102]

In long-term psychoses, CBT is used to complement medication and is adapted to meet individual needs. Interventions particularly related to these conditions include exploring reality testing, changing delusions and hallucinations, examining factors which precipitate relapse, and managing relapses.^[39]

Several meta-analyses suggested that CBT is effective in schizophrenia,^[40][103] Cochrane reviews reported CBT had "no effect on long‐term risk of relapse" and no evidence that CBT had an additional effect above standard care.^[104]

A 2012 systematic review investigated the effects of CBT compared with other psychosocial therapies for people with schizophrenia:

CBT is used to help people of all ages, but the therapy should be adjusted based on the age of the patient with whom the therapist is dealing. Older individuals in particular have certain characteristics that need to be acknowledged and the therapy altered to account for these differences thanks to age.^[106] Of the small number of studies examining CBT for the management of depression in older people, there is currently no strong support.^[107]

For anxiety disorders, use of CBT with people at risk has significantly reduced the number of episodes of generalized anxiety disorder and other anxiety symptoms, and also given significant improvements in explanatory style, hopelessness, and dysfunctional attitudes.^{[63][108][109]} In another study, 3% of the group receiving the CBT intervention developed generalized anxiety disorder by 12 months postintervention compared with 14% in the control group.^[110] Subthreshold panic disorder sufferers were found to significantly benefit from use of CBT.^[111][112] Use of CBT was found to significantly reduce social anxiety prevalence.^[113]

For depressive disorders, a stepped-care intervention (watchful waiting, CBT and medication if appropriate) achieved a 50% lower incidence rate in a patient group aged 75 or older.^[114] Another depression study found a neutral effect compared to personal, social, and health education, and usual school provision, and included a comment on potential for increased depression scores from people who have received CBT due to greater self recognition and acknowledgement of existing symptoms of depression and negative thinking styles.^[115] A further study also saw a neutral result.^[116] A meta-study of the Coping with Depression course, a cognitive behavioral intervention delivered by a psychoeducational method, saw a 38% reduction in risk of major depression.^[117]

For people at risk of psychosis, in 2014 the UK National Institute for Health and Care Excellence (NICE) recommended preventive CBT.^[118][119]

CBT is also used for pathological and problem gambling. The percentage of people who problem gamble is 1–3% around the world.^[120] Cognitive behavioral therapy develops skills for relapse prevention and someone can learn to control their mind and manage high-risk cases.^[121] There is evidence of efficacy of CBT for treating pathological and problem gambling at immediate follow up, however the longer term efficacy of CBT for it is currently unknown.^[122]

CBT looks at the habit of smoking cigarettes as a learned behavior, which later evolves into a coping strategy to handle daily stressors. Because smoking is often easily accessible, and quickly allows the user to feel good, it can take precedence over other coping strategies, and eventually work its way into everyday life during non-stressful events as well. CBT aims to target the function of the behavior, as it can vary between individuals, and works to inject other coping mechanisms in place of smoking. CBT also aims to support individuals suffering from strong cravings, which are a major reported reason for relapse during treatment.^[123]

In a 2008 controlled study out of Stanford University School of Medicine, suggested CBT may be an effective tool to help maintain abstinence. The results of 304 random adult participants were tracked over the course of one year. During this program, some participants were provided medication, CBT, 24 hour phone support, or some combination of the three methods. At 20 weeks, the participants who received CBT had a 45% abstinence rate, versus non-CBT participants, who had a 29% abstinence rate. Overall, the study concluded that emphasizing cognitive and behavioral strategies to support smoking cessation can help individuals build tools for long term smoking abstinence.^[124]

Mental health history can affect the outcomes of treatment. Individuals with a history of depressive disorders had a lower rate of success when using CBT alone to combat smoking addiction.^[125]

A Cochrane review was unable to find evidence of any difference between CBT and hypnosis for smoking cessation. While this may be evidence of no effect, further research may uncover an effect of CBT for smoking cessation.^[126]

Though many forms of treatment can support individuals with eating disorders, CBT is proven to be a more effective treatment than medications and interpersonal psychotherapy alone.^[37] CBT aims to combat major causes of distress such as negative cognitions surrounding body weight, shape and size. CBT therapists also work with individuals to regulate strong emotions and thoughts that lead to dangerous compensatory behaviors. CBT is the first line of treatment for Bulimia Nervosa, and Eating Disorder Non-Specific.^[127] While there is evidence to support the efficacy of CBT for bulimia nervosa and binging, the evidence is somewhat variable and limited by small study sizes.^[128]

Research has identified Internet addiction as a new clinical disorder that causes relational, occupational, and social problems. Cognitive behavioral therapy (CBT) has been suggested as the treatment of choice for Internet addiction, and addiction recovery in general has used CBT as part of treatment planning.^[129]

A Cochrane review of interventions aimed at preventing psychological stress in healthcare workers found that CBT was more effective than no intervention but no more effective than alternative stress-reduction interventions.^[130]

Precursors of certain fundamental aspects of CBT have been identified in various ancient philosophical traditions, particularly Stoicism.^[131] Stoic philosophers, particularly Epictetus, believed logic could be used to identify and discard false beliefs that lead to destructive emotions, which has influenced the way modern cognitive-behavioral therapists identify cognitive distortions that contribute to depression and anxiety.^[132] For example, Aaron T. Beck's original treatment manual for depression states, "The philosophical origins of cognitive therapy can be traced back to the Stoic philosophers".^[133] Another example of Stoic influence on cognitive theorists is Epictetus on Albert Ellis.^[134] A key philosophical figure who also influenced the development of CBT was John Stuart Mill.^[135]

The modern roots of CBT can be traced to the development of behavior therapy in the early 20th century, the development of cognitive therapy in the 1960s, and the subsequent merging of the two. Groundbreaking work of behaviorism began with John B. Watson and Rosalie Rayner's studies of conditioning in 1920.^[136] Behaviorally-centered therapeutic approaches appeared as early as 1924^[137] with Mary Cover Jones' work dedicated to the unlearning of fears in children.^[138] These were the antecedents of the development of Joseph Wolpe's behavioral therapy in the 1950s.^[136] It was the work of Wolpe and Watson, which was based on Ivan Pavlov's work on learning and conditioning, that influenced Hans Eysenck and Arnold Lazarus to develop new behavioral therapy techniques based on classical conditioning.^[136][139]

During the 1950s and 1960s, behavioral therapy became widely utilized by researchers in the United States, the United Kingdom, and South Africa, who were inspired by the behaviorist learning theory of Ivan Pavlov, John B. Watson, and Clark L. Hull.^[137] In Britain, Joseph Wolpe, who applied the findings of animal experiments to his method of systematic desensitization,^[136] applied behavioral research to the treatment of neurotic disorders. Wolpe's therapeutic efforts were precursors to today's fear reduction techniques.^[137] British psychologist Hans Eysenck presented behavior therapy as a constructive alternative.^[137][140]

At the same time of Eysenck's work, B. F. Skinner and his associates were beginning to have an impact with their work on operant conditioning.^[136][139] Skinner's work was referred to as radical behaviorism and avoided anything related to cognition.^[136] However, Julian Rotter, in 1954, and Albert Bandura, in 1969, contributed behavior therapy with their respective work on social learning theory, by demonstrating the effects of cognition on learning and behavior modification.^[136][139]

The emphasis on behavioral factors constituted the "first wave" of CBT.^[141]

One of the first therapists to address cognition in psychotherapy was Alfred Adler with his notion of basic mistakes and how they contributed to creation of unhealthy or useless behavioral and life goals.^[142] Adler's work influenced the work of Albert Ellis,^[142] who developed the earliest cognitive-based psychotherapy, known today as rational emotive behavior therapy, or REBT.^[143]

Around the same time that rational emotive therapy, as it was known then, was being developed, Aaron T. Beck was conducting free association sessions in his psychoanalytic practice.^[144] During these sessions, Beck noticed that thoughts were not as unconscious as Freud had previously theorized, and that certain types of thinking may be the culprits of emotional distress.^[144] It was from this hypothesis that Beck developed cognitive therapy, and called these thoughts "automatic thoughts".^[144]

It was these two therapies, rational emotive therapy and cognitive therapy, that started the "second wave" of CBT, which was the emphasis on cognitive factors.^[141]

Although the early behavioral approaches were successful in many of the neurotic disorders, they had little success in treating depression.^{[136][137][145]} Behaviorism was also losing in popularity due to the so-called "cognitive revolution". The therapeutic approaches of Albert Ellis and Aaron T. Beck gained popularity among behavior therapists, despite the earlier behaviorist rejection of "mentalistic" concepts like thoughts and cognitions.^[136] Both of these systems included behavioral elements and interventions and primarily concentrated on problems in the present.

In initial studies, cognitive therapy was often contrasted with behavioral treatments to see which was most effective. During the 1980s and 1990s, cognitive and behavioral techniques were merged into cognitive behavioral therapy. Pivotal to this merging was the successful development of treatments for panic disorder by David M. Clark in the UK and David H. Barlow in the US.^[137]

Over time, cognitive behavior therapy became to be known not only as a therapy, but as an umbrella term for all cognitive-based psychotherapies.^[136] These therapies include, but are not limited to, rational emotive therapy (REBT), cognitive therapy, acceptance and commitment therapy, dialectical behavior therapy, reality therapy/choice theory, cognitive processing therapy, EMDR, and multimodal therapy.^[136] All of these therapies are a blending of cognitive- and behavior-based elements.

This blending of theoretical and technical foundations from both behavior and cognitive therapies constituted the "third wave" of CBT.^{[146][141][141]} The most prominent therapies of this third wave are dialectical behavior therapy and acceptance and commitment therapy.^[141]

Despite increasing popularity of "third-wave" treatment approaches, reviews of studies reveal there may be no difference in the effectiveness compared with "non-third wave" CBT for the treatment of depression.^[147]

A typical CBT programme would consist of face-to-face sessions between patient and therapist, made up of 6-18 sessions of around an hour each with a gap of 1–3 weeks between sessions. This initial programme might be followed by some booster sessions, for instance after one month and three months.^[148] CBT has also been found to be effective if patient and therapist type in real time to each other over computer links.^[149][150]

Cognitive behavioral therapy is most closely allied with the scientist–practitioner model in which clinical practice and research is informed by a scientific perspective, clear operationalization of the problem, and an emphasis on measurement, including measuring changes in cognition and behavior and in the attainment of goals. These are often met through "homework" assignments in which the patient and the therapist work together to craft an assignment to complete before the next session.^[151] The completion of these assignments – which can be as simple as a person suffering from depression attending some kind of social event – indicates a dedication to treatment compliance and a desire to change.^[151] The therapists can then logically gauge the next step of treatment based on how thoroughly the patient completes the assignment.^[151] Effective cognitive behavioral therapy is dependent on a therapeutic alliance between the healthcare practitioner and the person seeking assistance.^[2][152] Unlike many other forms of psychotherapy, the patient is very involved in CBT.^[151] For example, an anxious patient may be asked to talk to a stranger as a homework assignment, but if that is too difficult, he or she can work out an easier assignment first.^[151] The therapist needs to be flexible and willing to listen to the patient rather than acting as an authority figure.^[151]

Computerized cognitive behavioral therapy (CCBT) has been described by NICE as a "generic term for delivering CBT via an interactive computer interface delivered by a personal computer, internet, or interactive voice response system",^[153] instead of face-to-face with a human therapist. It is also known as internet-delivered cognitive behavioral therapy or ICBT.^[154] CCBT has potential to improve access to evidence-based therapies, and to overcome the prohibitive costs and lack of availability sometimes associated with retaining a human therapist.^[155] In this context, it is important not to confuse CBT with 'computer-based training', which nowadays is more commonly referred to as e-Learning.

CCBT has been found in meta-studies to be cost-effective and often cheaper than usual care,^[156][157] including for anxiety.^[158] Studies have shown that individuals with social anxiety and depression experienced improvement with online CBT-based methods.^[159] A review of current CCBT research in the treatment of OCD in children found this interface to hold great potential for future treatment of OCD in youths and adolescent populations.^[160] Additionally, most internet interventions for posttraumatic stress disorder use CCBT. CCBT is also predisposed to treating mood disorders amongst non-heterosexual populations, who may avoid face-to-face therapy from fear of stigma. However presently CCBT programs seldom cater to these populations.^[161]

A key issue in CCBT use is low uptake and completion rates, even when it has been clearly made available and explained.^[162][163] CCBT completion rates and treatment efficacy have been found in some studies to be higher when use of CCBT is supported personally, with supporters not limited only to therapists, than when use is in a self-help form alone.^[156][164] Another approach to improving uptake and completion rate, as well as treatment outcome, is to design software that supports the formation of a strong therapeutic alliance between the user and the technology.^[165]

In February 2006 NICE recommended that CCBT be made available for use within the NHS across England and Wales for patients presenting with mild-to-moderate depression, rather than immediately opting for antidepressant medication,^[153] and CCBT is made available by some health systems.^[166] The 2009 NICE guideline recognized that there are likely to be a number of computerized CBT products that are useful to patients, but removed endorsement of any specific product.^[167]

A relatively new avenue of research is the combination of artificial intelligence and CCBT. It has been proposed to use modern technology to create CCBT that simulates face-to-face therapy. This might be achieved in cognitive behavior therapy for a specific disorder using the comprehensive domain knowledge of CBT.^[168] One area where this has been attempted is the specific domain area of social anxiety in those who stutter.^[169]

Another new method of access is the use of mobile app or smartphone applications to deliver self-help or guided CBT. Technology companies are developing mobile-based artificial intelligence chatbot applications in delivering CBT as an early intervention to support mental health, to build psychological resilience and to promote emotional well-being. Artificial intelligence (AI) text-based conversational application delivered securely and privately over smartphone devices have the ability to scale globally and offer contextual and always-available support. Active research is underway including real world data studies^[170] that measure effectiveness and engagement of text-based smartphone chatbot apps for delivery of CBT using a text-based conversational interface.

Enabling patients to read self-help CBT guides has been shown to be effective by some studies.^{[171][172][173]} However one study found a negative effect in patients who tended to ruminate,^[174] and another meta-analysis found that the benefit was only significant when the self-help was guided (e.g. by a medical professional).^[175]

Patient participation in group courses has been shown to be effective.^[176] In a meta-analysis reviewing evidence-based treatment of OCD in children, individual CBT was found to be more efficacious than group CBT.^[160]

Brief cognitive behavioral therapy (BCBT) is a form of CBT which has been developed for situations in which there are time constraints on the therapy sessions.^[177] BCBT takes place over a couple of sessions that can last up to 12 accumulated hours by design. This technique was first implemented and developed on soldiers overseas in active duty by David M. Rudd to prevent suicide.^[177]

Breakdown of treatment^[177]

Cognitive emotional behavioral therapy (CEBT) is a form of CBT developed initially for individuals with eating disorders but now used with a range of problems including anxiety, depression, obsessive compulsive disorder (OCD), post-traumatic stress disorder (PTSD) and anger problems. It combines aspects of CBT and dialectical behavioral therapy and aims to improve understanding and tolerance of emotions in order to facilitate the therapeutic process. It is frequently used as a "pretreatment" to prepare and better equip individuals for longer-term therapy.^[178]

Structured cognitive behavioral training (SCBT) is a cognitive-based process with core philosophies that draw heavily from CBT. Like CBT, SCBT asserts that behavior is inextricably related to beliefs, thoughts and emotions. SCBT also builds on core CBT philosophy by incorporating other well-known modalities in the fields of behavioral health and psychology: most notably, Albert Ellis's rational emotive behavior therapy. SCBT differs from CBT in two distinct ways. First, SCBT is delivered in a highly regimented format. Second, SCBT is a predetermined and finite training process that becomes personalized by the input of the participant. SCBT is designed with the intention to bring a participant to a specific result in a specific period of time. SCBT has been used to challenge addictive behavior, particularly with substances such as tobacco, alcohol and food, and to manage diabetes and subdue stress and anxiety. SCBT has also been used in the field of criminal psychology in the effort to reduce recidivism.

Moral reconation therapy, a type of CBT used to help felons overcome antisocial personality disorder (ASPD), slightly decreases the risk of further offending.^[179] It is generally implemented in a group format because of the risk of offenders with ASPD being given one-on-one therapy reinforces narcissistic behavioral characteristics, and can be used in correctional or outpatient settings. Groups usually meet weekly for two to six months.^[180]

This type of therapy uses a blend of cognitive, behavioral and some humanistic training techniques to target the stressors of the client. This usually is used to help clients better cope with their stress or anxiety after stressful events.^[181] This is a three-phase process that trains the client to use skills that they already have to better adapt to their current stressors. The first phase is an interview phase that includes psychological testing, client self-monitoring, and a variety of reading materials. This allows the therapist to individually tailor the training process to the client.^[181] Clients learn how to categorize problems into emotion-focused or problem-focused, so that they can better treat their negative situations. This phase ultimately prepares the client to eventually confront and reflect upon their current reactions to stressors, before looking at ways to change their reactions and emotions in relation to their stressors. The focus is conceptualization.^[181]

The second phase emphasizes the aspect of skills acquisition and rehearsal that continues from the earlier phase of conceptualization. The client is taught skills that help them cope with their stressors. These skills are then practised in the space of therapy. These skills involve self-regulation, problem-solving, interpersonal communication skills, etc.^[181]

The third and final phase is the application and following through of the skills learned in the training process. This gives the client opportunities to apply their learned skills to a wide range of stressors. Activities include role-playing, imagery, modeling, etc. In the end, the client will have been trained on a preventative basis to inoculate personal, chronic, and future stressors by breaking down their stressors into problems they will address in long-term, short-term, and intermediate coping goals.^[181]

Mindfulness-based cognitive behavioral hypnotherapy (MCBH) is a form of CBT focusing on awareness in reflective approach with addressing of subconscious tendencies. It is more the process that contains basically three phases that are used for achieving wanted goals.^[182]

The Unified Protocol for Transdiagnostic Treatment of Emotional Disorders (UP) is a form of CBT, developed by David H. Barlow and researchers at Boston University, that can be applied to a range of depression and anxiety disorders. The rationale is that anxiety and depression disorders often occur together due to common underlying causes and can efficiently be treated together.^[183]

The UP includes a common set of components:^[184]

The UP has been shown to produce equivalent results to single-diagnosis protocols for specific disorders, such as OCD and social anxiety disorder.^[185] The UP is disseminated by the Unified Protocol Institute ^[221] .

The research conducted for CBT has been a topic of sustained controversy. While some researchers write that CBT is more effective than other treatments,^[59] many other researchers^{[16][186][14][60][187]} and practitioners^[188][189] have questioned the validity of such claims. For example, one study^[59] determined CBT to be superior to other treatments in treating anxiety and depression. However, researchers^[14] responding directly to that study conducted a re-analysis and found no evidence of CBT being superior to other bona fide treatments, and conducted an analysis of thirteen other CBT clinical trials and determined that they failed to provide evidence of CBT superiority. In cases where CBT has been reported to be statistically better than other psychological interventions in terms of primary outcome measures, effect sizes were small and suggested that those differences were clinically meaningless and insignificant. Moreover, on secondary outcomes (i.e., measures of general functioning) no significant differences have been typically found between CBT and other treatments.^[14][190]

A major criticism has been that clinical studies of CBT efficacy (or any psychotherapy) are not double-blind (i.e., either the subjects or the therapists in psychotherapy studies are not blind to the type of treatment). They may be single-blinded, i.e. the rater may not know the treatment the patient received, but neither the patients nor the therapists are blinded to the type of therapy given (two out of three of the persons involved in the trial, i.e., all of the persons involved in the treatment, are unblinded). The patient is an active participant in correcting negative distorted thoughts, thus quite aware of the treatment group they are in.^[191]

The importance of double-blinding was shown in a meta-analysis that examined the effectiveness of CBT when placebo control and blindedness were factored in.^[192] Pooled data from published trials of CBT in schizophrenia, major depressive disorder (MDD), and bipolar disorder that used controls for non-specific effects of intervention were analyzed. This study concluded that CBT is no better than non-specific control interventions in the treatment of schizophrenia and does not reduce relapse rates; treatment effects are small in treatment studies of MDD, and it is not an effective treatment strategy for prevention of relapse in bipolar disorder. For MDD, the authors note that the pooled effect size was very low. Nevertheless, the methodological processes used to select the studies in the previously mentioned meta-analysis and the worth of its findings have been called into question.^{[193][194][195]}

Additionally, a 2015 meta-analysis revealed that the positive effects of CBT on depression have been declining since 1977. The overall results showed two different declines in effect sizes: 1) an overall decline between 1977 and 2014, and 2) a steeper decline between 1995 and 2014. Additional sub-analysis revealed that CBT studies where therapists in the test group were instructed to adhere to the Beck CBT manual had a steeper decline in effect sizes since 1977 than studies where therapists in the test group were instructed to use CBT without a manual. The authors reported that they were unsure why the effects were declining but did list inadequate therapist training, failure to adhere to a manual, lack of therapist experience, and patients' hope and faith in its efficacy waning as potential reasons. The authors did mention that the current study was limited to depressive disorders only.^[196]

Furthermore, other researchers^[60] write that CBT studies have high drop-out rates compared to other treatments. At times, the CBT drop-out rates can be more than five times higher than other treatments groups.^[60] This high drop-out rate is also evident in the treatment of several disorders, particularly the eating disorder anorexia nervosa, which is commonly treated with CBT. Those treated with CBT have a high chance of dropping out of therapy before completion and reverting to their anorexia behaviors.^[197]

Other researchers^[187] conducting an analysis of treatments for youths who self-injure found similar drop-out rates in CBT and DBT groups. In this study, the researchers analyzed several clinical trials that measured the efficacy of CBT administered to youths who self-injure. The researchers concluded that none of them were found to be efficacious^[187]

The methods employed in CBT research have not been the only criticisms; some individuals have called its theory and therapy into question.^[198]

Slife and Williams^[188] write that one of the hidden assumptions in CBT is that of determinism, or the absence of free will. They argue that CBT holds that external stimuli from the environment enter the mind, causing different thoughts that cause emotional states: nowhere in CBT theory is agency, or free will, accounted for.

Another criticism of CBT theory, especially as applied to major depressive disorder (MDD), is that it confounds the symptoms of the disorder with its causes.^[191]

CBT is generally seen as having very low if any side effects.^{[199][200][201]} Calls have been made for more appraisal of CBT side effects.^[202][203]

The writer and group analyst Farhad Dalal questions the socio-political assumptions behind the introduction of CBT, connecting the rise of CBT with 'the parallel rise of neoliberalism, with its focus on marketization, efficiency, quantification and managerialism'.^[204] Dalal also questions both the scientific and the ethical basis of CBT.^[205]

The UK's National Health Service announced in 2008 that more therapists would be trained to provide CBT at government expense^[206] as part of an initiative called Improving Access to Psychological Therapies (IAPT).^[207] the NICE said that CBT would become the mainstay of treatment for non-severe depression, with medication used only in cases where CBT had failed.^[206] Therapists complained that the data does not fully support the attention and funding CBT receives. Psychotherapist and professor Andrew Samuels stated that this constitutes "a coup, a power play by a community that has suddenly found itself on the brink of corralling an enormous amount of money ... Everyone has been seduced by CBT's apparent cheapness."^[206][208] The UK Council for Psychotherapy issued a press release in 2012 saying that the IAPT's policies were undermining traditional psychotherapy and criticized proposals that would limit some approved therapies to CBT,^[209] claiming that they restricted patients to "a watered down version of cognitive behavioural therapy (CBT), often delivered by very lightly trained staff".^[209]

The NICE also recommends offering CBT to people suffering from schizophrenia, as well as those at risk of suffering from a psychotic episode.^[210][211]