The word dialectical points to the whole method in a single idea: two opposite things can be true together. You can be doing the best you can, and you can need to do better. Holding both, rather than choosing one, is where DBT begins.
Dialectical behaviour therapy is a structured, skills-based talking therapy that balances acceptance and change to help people manage overwhelming emotions and stop acting on them in harmful ways. It was created by Marsha Linehan for borderline personality disorder and chronic suicidality, and it teaches four sets of skills through a combination of individual therapy, a weekly skills group, and phone coaching. Its evidence for reducing self-harm and suicidal behaviour is among the strongest in psychotherapy.
Where DBT came from
DBT began with a practical failure. In the 1980s, the psychologist Marsha Linehan set out to apply standard behaviour therapy to women with chronic suicidal thoughts, many of whom would later be described as having borderline personality disorder. The change-focused methods she started with kept backfiring. When she pressed clients to think and behave differently, many heard the message that their pain was their own fault, felt invalidated, and either dropped out or grew more distressed.
Linehan, who has written openly about her own history of severe mental illness and hospitalisation as a young woman, drew on an unusual combination of sources to fix this. She kept the practical, behavioural core of therapy but added acceptance drawn from mindfulness and contemplative practice. The result was a treatment that could say, in effect, that a person is doing the best they can given everything that has shaped them, and that they still need to learn new ways to cope. That refusal to choose between the two is the dialectic that gives the therapy its name.
The biosocial theory
Underneath the therapy sits an explanation of how the difficulties it treats arise. Linehan called it the biosocial theory, and it describes emotion dysregulation as the product of two things acting on each other over time, rather than of either one alone.
The first ingredient is biological: some people are simply more emotionally sensitive from the start. They react to smaller triggers, their feelings peak higher, and it takes them longer to return to baseline. The second is environmental: an invalidating environment, one that dismisses, punishes, or oversimplifies a child's emotional responses, telling them their feelings are wrong, excessive, or manipulative. Neither factor alone is usually enough. It is the transaction between a sensitive temperament and a chronically invalidating environment that, over years, can leave a person without reliable ways to name, soothe, or regulate what they feel.
This framing matters because it removes blame without removing responsibility. The person did not choose their sensitivity or their upbringing, which is why acceptance is fair. But they can still learn the skills they were never given, which is why change is possible. The whole treatment follows from that logic.
The four skill modules
The teaching heart of DBT is a set of concrete skills, grouped into four modules. Two lean toward acceptance and two toward change, mirroring the dialectic at the centre of the therapy. The techniques page works through each in detail; here is the shape of them.
Mindfulness
The foundation of every other skill. Learning to observe thoughts, feelings, and sensations as they are, without judging or reacting automatically, and to access what DBT calls wise mind, the balance of reason and emotion.
Distress tolerance
Ways to survive a crisis without making it worse, when a strong emotion cannot be changed in the moment. This includes practical self-soothing and the harder skill of radical acceptance of painful reality.
Emotion regulation
Understanding what emotions do, reducing vulnerability to intense mood swings, and changing unwanted emotions by acting against the urges they carry rather than obeying them.
Interpersonal effectiveness
Asking for what you need, saying no, and handling conflict while keeping both the relationship and your self-respect intact, using structured approaches rather than reacting on impulse.
The modules are usually taught in a rotating group over about six months to a year, so that a full course cycles through all four, often more than once.
The four components of standard DBT
DBT is not just a class in skills. In its full, standard form it is a comprehensive programme with four moving parts, each doing a different job. Skills alone, without this structure, are a lighter intervention and a different thing.
Individual therapy follows a hierarchy of targets, tackling life-threatening behaviours first, then behaviours that get in the way of therapy, then those that damage quality of life. Phone coaching exists so skills get used in the heat of a crisis rather than only recalled afterwards. The consultation team, sometimes described as therapy for the therapists, keeps the people delivering this demanding work skilful and steady. Take any component away and the treatment is no longer standard DBT.
Who DBT is for
DBT was designed for a specific and underserved group, and its reach has grown from there. Its natural home is people whose central problem is emotion that is too intense to manage and that spills into harmful action.
Its clearest use is borderline personality disorder and chronic suicidality or self-harm, where the evidence is strongest. It has since been adapted for eating disorders marked by loss of control, substance use, self-harm in adolescents, and other conditions linked to emotion dysregulation. The applications page covers these in depth. DBT is demanding, on both client and clinician, and it is not the right first choice for every problem. But for the difficulties it was built for, few treatments have matched it.
What DBT is not
Because DBT has become well known, some misunderstandings travel with it. Two are worth clearing up at the start.
DBT is just mindfulness and relaxation.
Mindfulness is one of four modules and the foundation of the rest, but DBT is far more than that. It is a structured behavioural treatment with a target hierarchy, phone coaching, and hard change-focused work on emotions and relationships. Calling it a mindfulness course misses most of what it does.
DBT is only for borderline personality disorder.
That is where it started and where its evidence is strongest, but it is not a diagnosis-specific technique. Because its real target is emotion dysregulation, it has been adapted for a range of conditions in which intense, poorly managed emotion is the shared thread. The evidence outside its original population is more mixed, which the research page explores.
Where to go next
This overview sets out what DBT is and why it is built the way it is. The other pages in this section go deeper into how it is done and how well it works.
Sources
- Linehan MM. Cognitive-Behavioral Treatment of Borderline Personality Disorder. Guilford Press. 1993.
- Linehan MM. DBT Skills Training Manual. 2nd ed. Guilford Press. 2015.
- National Institute for Health and Care Excellence (NICE). Borderline personality disorder: recognition and management. CG78. 2009.
This page is educational and is not medical advice. It does not diagnose any condition or replace treatment. If you are struggling with your mental health or with thoughts of self-harm, speak with a qualified professional about whether DBT or another approach is right for you.