Third wave therapies are a group of psychological treatments that evolved from traditional cognitive behavioral therapy (CBT) but take a fundamentally different approach to difficult thoughts and emotions. Rather than trying to change or eliminate negative thinking, these therapies focus on changing your relationship to those thoughts: noticing them without getting caught up in them, accepting uncomfortable feelings instead of fighting them, and building a life guided by personal values even when distress is present. The term “third wave” places them in a historical sequence, following behavioral therapy (first wave) and cognitive therapy (second wave).
How Third Wave Differs From Traditional CBT
Traditional CBT operates on a straightforward premise: certain thoughts and beliefs cause emotional suffering, so if you identify and correct those thoughts, the suffering decreases. If you’re anxious about a job interview, a CBT therapist might help you challenge the belief “I’m going to fail” and replace it with something more realistic.
Third wave therapies don’t ask you to argue with your thoughts. Instead, they treat thoughts as mental events you can observe and let pass, rather than statements you need to believe or disprove. The technical term for this shift is “cognitive defusion,” the ability to see a thought as just a thought rather than a fact that demands your attention. Where traditional CBT focuses on the content of what you’re thinking, third wave approaches care more about the context: how you relate to the thought, what function it serves, and whether reacting to it moves you toward or away from the life you want.
A hallmark of all third wave therapies is their transdiagnostic approach. Rather than targeting a specific diagnosis like depression or anxiety, they address psychological processes that cut across many conditions, things like self-criticism, avoidance of uncomfortable experiences, or getting fused with unhelpful thought patterns. This makes them flexible tools that therapists can adapt across a wide range of mental health concerns.
Acceptance and Commitment Therapy (ACT)
ACT (pronounced as the word “act,” not the initials) is built around a concept called psychological flexibility: the ability to stay present with whatever you’re feeling, even when it’s unpleasant, and still take action that aligns with what matters to you. The therapy works through six interconnected processes: paying attention to the present moment, accepting emotions rather than suppressing them, learning to step back from unhelpful thoughts, developing a broader sense of self that isn’t defined by any single experience, clarifying personal values, and committing to actions based on those values.
In practice, ACT often uses metaphors and experiential exercises rather than worksheets or thought records. A therapist might ask you to imagine your thoughts as passengers on a bus you’re driving. The passengers shout directions, but you still choose where to steer. The goal isn’t to feel better in the moment. It’s to stop letting the avoidance of discomfort run your life, and to invest energy in things that genuinely matter to you. Meta-analyses have found moderate effect sizes for ACT across conditions including depression and substance use, and ACT tends to have lower dropout rates than some other third wave approaches.
Dialectical Behavior Therapy (DBT)
DBT was originally developed for people with borderline personality disorder, particularly those experiencing chronic suicidal thoughts and self-harm. It has since been applied to eating disorders, substance use, and other conditions where emotions feel overwhelming and hard to regulate. The “dialectical” in the name refers to balancing two things that seem like opposites: fully accepting yourself as you are right now, while also working to change.
The therapy teaches four specific skill sets. Mindfulness skills help you observe your thoughts and feelings without immediately reacting. Distress tolerance skills give you ways to get through a crisis without turning to harmful behaviors like substance use or self-injury. Emotion regulation skills reduce your vulnerability to intense emotional swings. Interpersonal effectiveness skills help you advocate for your needs, set boundaries, and maintain relationships.
Standard DBT is one of the more intensive third wave therapies. It typically combines weekly individual therapy sessions with weekly group skills training, plus phone coaching between sessions for moments of crisis. This structure reflects the population it was designed for: people whose emotional pain is severe and whose existing coping strategies are dangerous.
Mindfulness-Based Cognitive Therapy (MBCT)
MBCT was designed specifically to prevent depression relapse. People who have experienced multiple episodes of depression develop something called cognitive reactivity: even a mild dip in mood can reactivate deeply ingrained patterns of negative self-referential thinking. A small disappointment spirals into “I’m worthless” or “nothing will ever change,” which pulls them back into a full depressive episode.
MBCT addresses this by training people to stabilize their attention (typically through body-focused meditation), recognize when those old thought patterns are firing up, and then “decenter” from them, seeing the thoughts as passing mental weather rather than accurate reflections of reality. The program is usually delivered in a group format over eight weeks, combining guided meditation practices with elements of cognitive therapy. Research consistently shows it reduces relapse rates in people who have had three or more depressive episodes.
Compassion Focused Therapy (CFT)
CFT was developed for people whose primary struggle is intense shame and self-criticism, emotions that often don’t respond well to standard CBT. You can logically understand that your self-critical thoughts are distorted and still feel terrible, because the problem isn’t in the logic. It’s in the emotional system driving the criticism.
CFT organizes human emotion around three systems. The threat system generates fear, anger, and anxiety in response to danger. The drive system motivates you to pursue goals, achievements, and rewards. The soothing system creates feelings of safety, calm, and connection. People who grew up in harsh or neglectful environments often have an overactive threat system and an underdeveloped soothing system. They’re quick to feel attacked (including by their own inner critic) and struggle to feel safe or comforted. CFT uses guided exercises, imagery, and breathing techniques to strengthen the soothing system, essentially training the brain to access feelings of warmth and safety that may have been absent in early life.
Schema Therapy
Schema therapy targets deep emotional patterns that form in childhood and persist into adulthood. These patterns, called early maladaptive schemas, are broad themes about yourself and your relationships: beliefs like “I’ll always be abandoned,” “I’m fundamentally defective,” or “my needs don’t matter.” Unlike a passing negative thought, schemas are deeply wired and shape how you interpret nearly everything that happens to you.
The therapy works by identifying which schemas are active, understanding the coping strategies you’ve built around them (which often cause their own problems), and gradually healing those patterns through a combination of emotional exercises, cognitive techniques, and the therapeutic relationship itself. Schema therapy tends to be longer-term than other third wave approaches and is commonly used for personality disorders and chronic conditions that haven’t responded to shorter treatments.
How Effective Are Third Wave Therapies?
The evidence base is substantial and growing, though it varies by specific therapy and condition. A large network meta-analysis of depression treatments found that none of the third wave therapies were significantly more or less effective than traditional CBT. All of them (except DBT and schema therapy, which had limited data in that analysis) outperformed waitlist and treatment-as-usual conditions, with effect sizes ranging from 0.78 to 1.99. Metacognitive therapy showed particularly strong results in head-to-head comparisons with other third wave approaches for depression.
For post-traumatic stress, third wave therapies produced medium-to-large effects in reducing symptoms. However, established trauma-focused treatments like cognitive processing therapy and prolonged exposure still showed larger overall effect sizes in meta-analyses. Acceptability is also worth noting: people in third wave therapy trials drop out at roughly the same rates as those in traditional CBT, suggesting these treatments aren’t harder to tolerate despite their emphasis on sitting with discomfort.
One recurring concern in the research is methodological quality. An influential 2008 meta-analysis by Lars Öst found moderate effect sizes for ACT and DBT across multiple conditions but flagged that many studies used waitlist control groups rather than active comparison treatments, which can inflate the apparent benefit. The evidence has strengthened since then, but the field is still maturing compared to traditional CBT’s decades of research.
Choosing Between Approaches
Each third wave therapy has strengths that match particular struggles. DBT is the go-to for emotional volatility, self-harm, and borderline personality disorder. MBCT is most clearly supported for preventing depression relapse in people with recurrent episodes. ACT applies broadly and works well when avoidance of discomfort is keeping you stuck. CFT is a strong fit when shame and self-criticism are central to your difficulties. Schema therapy suits deep-rooted patterns tied to childhood experiences, especially when shorter therapies haven’t helped.
In practice, many therapists blend elements from multiple approaches rather than adhering rigidly to one. The shared emphasis on mindfulness, acceptance, and values means these therapies overlap more than they differ. What unites them is the core insight that fighting against your internal experience often makes things worse, and that learning to hold difficult feelings with openness, rather than battling or avoiding them, creates space for meaningful change.