Group Therapy
Group Psychotherapy
Evidence grade varies by use. See the breakdown on the entry. Read how the Atlas grades evidence.
Strong for overall efficacy and format equivalence. In a series of 11 meta-analyses spanning 329 studies, Gary Burlingame and colleagues reported group therapy effective across depression and bipolar disorders, schizophrenia, anxiety and panic disorders, social anxiety, obsessive-compulsive disorder, post-traumatic stress, eating disorders, borderline personality disorder, substance use disorders, and chronic pain. A separate meta-analysis of randomized trials reported essentially no outcome difference between matched group and individual formats when treatment, patients, and dose were held equal; the authors noted that reported nonequivalence favoring individual therapy tracked with individual arms receiving substantially more sessions, which they read as a dose effect rather than a format effect. Group treatment is described as broadly more cost-efficient because one clinician treats several people per hour. Burlingame, McClendon, and Yang (2018) reported a cohesion-outcome correlation of about r = .26 across roughly 55 studies, which they described as comparable to the alliance-outcome link in individual therapy. The grade 4 reflects strong and replicated equivalence and efficacy evidence; it is held at 4 rather than 5 because reported effects vary by condition and by how well groups are delivered, and because format equivalence depends on fair dose comparisons.
Reference only. Not medical advice.
| Treatment | Grade | Notes |
|---|---|---|
| Depression and anxiety disorders (incl. social anxiety, panic, OCD) | 4 of 5 | Multiple meta-analyses report efficacy comparable to individual therapy when dose is matched; among the best-supported uses. |
| Substance use disorders | 4 of 5 | Widely delivered and supported; SAMHSA treatment protocols include group formats, and group is generally equal or more cost-effective than individual counseling. Provider-managed condition. |
| Post-traumatic stress disorder | 3 of 5 | Group formats show benefit in meta-analytic work, though reported effect sizes and comparisons to individual trauma-focused therapy are more variable. |
| Eating disorders and borderline personality disorder | 3 of 5 | Included in the efficacy literature and used within structured programs; reported evidence is real but more heterogeneous and condition-dependent. Needs clinical management. |
| Schizophrenia and serious mental illness | 3 of 5 | Group approaches are used adjunctively with reported benefit; described as one component of multimodal care, not a standalone treatment. |
What can go wrong
Generally low physical risk under a trained leader. Real considerations include confidentiality limits (other members are not bound by clinician confidentiality the way a therapist is), the risk of a poorly matched member dominating or destabilizing a group, and potential distress when hearing others' material. People in acute crisis, active self-harm or suicidality, acute eating-disorder behavior, or unmanaged addiction need individual clinical assessment and management first; in those situations group is an adjunct or later step, not a substitute. Unfacilitated or peer-only "groups" marketed as therapy are not equivalent to clinician-led group psychotherapy.
This is something to take to a clinician. The Atlas can tell you what is known about group therapy in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.
Group therapy is psychotherapy delivered to several people at once by one or more trained clinicians, who use the relationships among members as part of the treatment rather than treating each person in parallel. The communal premise came first: the deeper lineage runs through communal and ceremonial healing circles across Indigenous America, Africa and its diaspora, and the Pacific, where distress was treated as a shared rather than private matter. The clinical form was later named in early-20th-century Boston, where internist Joseph Hersey Pratt began holding "classes" for tuberculosis patients in 1905 and reported that the meetings themselves lifted morale and instilled hope. The strongest claim the evidence supports is comparability: across hundreds of studies, researchers report that group formats produce outcomes broadly equal to individual therapy for many conditions, at lower cost per patient. The mechanisms most often credited by proponents, Yalom's universality, cohesion, hope, altruism, and interpersonal learning, are well described and partly measured, though the overall efficacy of the format rests on firmer ground than the precise weight of any single factor. Because group therapy is used for conditions that require clinical management, it belongs with a qualified provider rather than as self-directed care.
A trained clinician treats several people at once, using the company of fellow members as part of the treatment.
How it works
Well-supported in the outcome literature: structured group treatment delivers the same active components described in individual therapy (a trained leader, a coherent model, repeated practice) to several people at once, and researchers report comparable symptom change across many conditions. The peer setting is described as adding in-session opportunities to be witnessed, to give and receive feedback, and to rehearse new behavior with others present. Proposed and claimed by proponents: Irvin Yalom described 11 therapeutic factors said to drive change, including universality (recognizing one is not alone), group cohesiveness (a felt sense of belonging), instillation of hope, altruism, interpersonal learning, and imitative behavior or modeling. Yalom and other proponents describe cohesion as the central factor said to enable the others. The overall efficacy of group treatment is well supported in the literature; the specific causal weight of each named factor is described and partly measured but, by the field's own accounts, less firmly established than the format's overall effect.
What people get wrong
Often saidGroup therapy is a cheaper, watered-down substitute that works less well than seeing a therapist one-on-one.
ActuallyAcross many conditions, researchers report that matched group and individual formats produce comparable outcomes; reported gaps usually track session count, not format. It is described as more efficient, not inherently weaker.
Often saidAny peer support meeting or online 'group' counts as group therapy.
ActuallyClinical group psychotherapy is led by trained clinicians using a defined model. Unfacilitated peer or commercial 'groups' are not equivalent and are not what the efficacy evidence measured.
Who profits, and who pushes back
Gary M. Burlingame, PhD
His team reports essentially no outcome difference between matched group and individual formats, with group offering clear efficiency.
Irvin D. Yalom, MD
Describes cohesion and universality as the engine of change, the felt recognition that one is not alone in one's distress.
American Group Psychotherapy Association
Sells this. Has a commercial interest in a product sold as this compound, as of July 2026.
Promotes group therapy as effective and trains clinicians in it; has a membership and commercial interest in the field's growth.
Clinical reviewers (general)
Note that equivalence claims hinge on fair dose matching and that reported effects and delivery quality vary by condition, urging condition-specific reading rather than a blanket label.
Where the research comes from
Most of the published research on this comes from one place. 90% of it is from United States. Findings that no unrelated group has reproduced are weaker than the study count makes them look.
| Place | Share of published research |
|---|---|
| United States | 90% |
| United Kingdom and European Union | 80% |
| Australia and New Zealand | 70% |
| East Asia (China, Japan, Korea) | 55% |
| Sub-Saharan Africa (community and clinical forms) | 50% |
How we got here
Long before clinics, communal healing happened in circles. Indigenous peoples across the Americas convened talking and council circles in which each speaker held the floor while others listened without judgment, with the stated aim of restoring balance to the person and the group at once. Across the African continent and its diaspora, healing ceremonies built around song, drumming, dance, and shared storytelling treated distress as a collective matter rather than a private one, organizing care through frameworks of communal responsibility later named in principles such as Ubuntu and the Nguzo Saba. Pacific and Polynesian traditions similarly placed group ritual, recitation, and reconciliation (such as the Hawaiian practice of hooponopono) at the center of restoring a person to wellness. These communal forms treated suffering as something a gathered community works through together, a premise that modern clinical group therapy later reorganized inside a clinical room. Enel presents the clinical format as one descendant among several, not the origin of these living traditions.
The communal premise came first. Indigenous American talking and council circles, African and diasporic healing ceremonies organized around song, drum, and shared story, and Pacific reconciliation rituals such as the Hawaiian hooponopono all treated suffering as something a gathered community works through together, long predating any clinical formulation and still practiced today. The modern clinical thread is usually dated to 1905, when Joseph Hersey Pratt, a Boston internist, gathered tuberculosis patients into a "class" he intended for hygiene instruction and reported that the shared meetings gave members courage and hope. Through the 1920s and 1930s clinicians extended group methods to psychiatric and psychological problems. Jacob Moreno popularized the term "group psychotherapy" and developed psychodrama in the same era. The field matured after the Second World War, and Irvin Yalom's 1970 text, The Theory and Practice of Group Psychotherapy, systematized the therapeutic factors that proponents still use to explain why groups are said to work.
- Pre-modernCommunal healing circles practiced across Indigenous America, Africa and its diaspora, and the Pacific treat distress as collective; many remain in practice.
- 1905Joseph Hersey Pratt convenes tuberculosis 'classes' in Boston and reports their morale-lifting effect.
- 1920s-1930sJacob Moreno popularizes the term 'group psychotherapy' and develops psychodrama; methods spread to psychiatric care.
- 1970Irvin Yalom publishes The Theory and Practice of Group Psychotherapy, codifying the therapeutic factors proponents use to explain groups.
- 2016-2018Burlingame and colleagues publish a meta-analytic series and a cohesion-outcome meta-analysis reporting efficacy and equivalence.
How it is understood
Group methods draw on living communal-healing traditions (Indigenous American talking circles, African-centered healing circles, Pacific reconciliation rituals such as hooponopono) that predate and differ from clinical group therapy. These traditions remain practiced by their communities and are not interchangeable with billable clinical groups. Enel presents the clinical format as one descendant among several, not the origin, and does not claim authority over the source traditions.
Where scholars disagree
The communal-healing forms named here (Indigenous American talking and council circles, African and diasporic healing ceremonies, Pacific reconciliation rituals such as hooponopono) belong to living traditions whose communities have raised active concerns about extraction and commercialization of their ceremonial practices into billable clinical formats. Enel names these origins, treats the clinical group as one descendant rather than the source, and does not claim that the source traditions are interchangeable with or owned by the clinical field.
The literature treats two claims separately: that group therapy works (well supported as an outcome) and why it works (the causal weight of specific therapeutic factors, which is contested and less firmly established).
Irvin Yalom and group-process proponents
Group-specific therapeutic factors, with cohesion and universality as the engine, are what drive change in groups; cohesion is described as the central factor that enables the others.
What it rests onYalom's framework of 11 therapeutic factors and cohesion-outcome correlations reported by Burlingame, McClendon, and Yang (2018) at about r = .26 across roughly 55 studies, described as comparable to the alliance-outcome link in individual therapy.
Methodologists and equivalence-focused reviewers
The format's overall efficacy is well established, but the specific causal weight of any single named factor is only partly measured; observed cohesion-outcome correlations are associations, not demonstrated mechanism, and equivalence to individual therapy may reflect shared common factors and dose rather than group-specific ingredients.
What it rests onMatched group-versus-individual RCT meta-analyses showing equivalence that tracks with dose, and correlational (not causal) cohesion-outcome data.
This disagreement is live. It has not settled.
At a glance
- Deeper lineage
- Communal healing circles across Indigenous America, Africa and its diaspora, and the Pacific long predate the clinical form and are still practiced.
- Clinical origin
- 1905, Boston: internist Joseph Hersey Pratt's tuberculosis 'classes,' the first documented clinical group method.
- Core evidence
- A series of 11 meta-analyses across 329 studies plus matched RCT meta-analyses report outcomes broadly equal to individual therapy.
- Cost profile
- One clinician treats several patients per hour, which is described as more cost-efficient than equivalent individual care.
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Group Therapy. A short entry is not a safe entry.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- How it compares. We have not set it against the alternatives.
- Children and teenagers. We have not checked what is known about younger people.
- What people take it for. We have not catalogued the claims made for it.
Sources
No sources recorded for this entry yet. Nothing on this page can be checked against a citation until that changes, so treat it as a summary awaiting its evidence.