What is CBT? Cognitive behavioral therapy in plain English

By CBT Guide USA editorial team · Updated 2026-11-08 · Editorial policy

CBT is a structured, practical talk therapy that helps you notice how your thoughts, feelings and actions affect each other, and then test out changes.

The core idea

CBT starts from a simple observation: in a given situation, what you think, what you feel (emotionally and physically) and what you do all influence each other. The National Institute of Mental Health describes CBT as helping people notice automatic ways of thinking that are inaccurate or harmful, question them, and change self-defeating patterns.

The "behavioral" side matters as much as the "cognitive" side. When mood is low, people often do less, which leaves fewer chances for pleasure or achievement, which lowers mood further. Behavioral activation, a technique widely used within CBT, breaks that cycle by planning small, specific activities. A 2014 meta-analysis of 26 trials found behavioral activation more effective than control conditions for depression, although the authors noted that study quality was low in most trials (Ekers et al., 2014).

What CBT sessions involve

CBT tends to be more structured than open-ended talk therapy. A typical course looks like this:

• Assessment and goals. The therapist asks about your current difficulties, history and what you want to change. Goals are specific, for example "get back to the gym twice a week" rather than "feel better".
• Agenda. Many sessions start by agreeing what to cover and reviewing last week's practice.
• Skills. You learn techniques such as thought records, activity scheduling, problem solving or gradual exposure. Our CBT techniques guide walks through worked examples.
• Practice between sessions. The NHS notes that CBT relies on practice between sessions, often tracked with worksheets or a diary.
• Review. Progress is checked, often with short questionnaires, and the plan is adjusted.

On length, the NHS says people usually have 5 to 15 sessions. For adults with depression, NICE guidance describes individual CBT as usually 8 regular sessions for less severe depression and usually 16 for more severe depression, noting that more may be needed for people with other health problems, complex social needs or remaining symptoms. To see what the early weeks can look like, read online therapy week by week.

What CBT is used for

The NHS lists CBT as a treatment for a wide range of problems, including depression, anxiety disorders (including social anxiety, phobias and OCD), PTSD, eating disorders and sleep problems. For some of these, CBT is adapted into specialized forms, such as exposure-based treatment for anxiety, and people with more complex conditions may need specialist services rather than general CBT.

What the evidence says

CBT is the most studied psychological treatment for depression. A 2023 meta-analysis pooled 409 randomized trials with 52,702 patients (Cuijpers et al., 2023). Key findings:

• CBT had moderate to large effects compared with control conditions such as care as usual and waitlist, and effects were still significant 6 to 12 months later.
• CBT was only slightly more effective than other psychotherapies, and that difference was not significant in most sensitivity analyses. In other words, CBT is well supported, but other good therapies may work about as well.
• Short-term effects did not differ significantly from medication; combined treatment beat medication alone.

Two cautions. First, averages across trials do not predict any one person's result. Second, this research is about CBT in general. It does not tell you how well a particular provider or app delivers it.

Limits and who it may not suit

• It takes active work. CBT asks for homework. When energy is very low, that can feel hard; a good therapist adjusts the pace.
• It focuses on the present. If you mainly want to explore your past at length, another approach may suit you better.
• It does not replace medical care. Some people need medication, a medical check-up or specialist services, alone or alongside therapy.
• It is not crisis care. If you are thinking about suicide or self-harm, call or text 988 in the US, or call 911 in an emergency. See our crisis resources.

CBT online

CBT can be delivered by video, phone, messaging or through guided online programs. A large analysis of internet-based CBT for depression found both guided and unguided programs did better than control conditions, and that therapist-guided programs did better than unguided ones after treatment, especially for people with moderate to severe symptoms (Karyotaki et al., 2021). Our guide to how online therapy works covers the practical side, and therapy vs apps compares the formats.

If depression is the reason you are looking into CBT, see online therapy for depression, which covers suitability, costs and when other care is needed. One subscription option, Online-Therapy.com, is built around a CBT program with worksheets; our review sets out its pros and cons.