Group Therapy and Peer Support

Group therapy and peer support are interventions in which people gain therapeutic benefit through interaction with others who share similar experiences. Group psychotherapy is led by trained facilitators and uses group processes deliberately, while peer support draws on the shared lived experience of people who have themselves faced mental health or substance-use challenges.

Definition

Group therapy is a form of psychotherapy in which one or more clinicians treat several clients together, using interpersonal processes within the group as agents of change; peer support is the provision of encouragement, information and role-modelling by individuals with shared lived experience of mental illness or addiction.

Scope

This entry covers the therapeutic factors that operate in groups, the distinction between professionally led group therapy and peer-led mutual support, and the emerging evidence on peer recovery support. It is a reference orientation, not a manual for running groups or directing an individual's care.

Core questions

• What therapeutic factors are specific to working in a group rather than individually?
• How does peer support differ from professionally led group therapy?
• What does the evidence indicate about peer recovery support and recovery-oriented services?

Key concepts

• Universality and instillation of hope
• Group cohesiveness
• Interpersonal learning
• Altruism and mutual aid
• Peer support and lived experience
• Recovery-oriented practice
• Facilitator role

Key theories

Therapeutic factors in group psychotherapy

Yalom and Leszcz describe factors such as universality, instillation of hope, interpersonal learning, group cohesiveness and altruism as mechanisms through which group membership produces therapeutic change.

Mechanisms

Groups are thought to work through a set of therapeutic factors that arise from membership itself: recognising that others share one's difficulties (universality), gaining hope from peers further along in recovery, learning from interpersonal feedback, experiencing cohesion, and helping others (altruism). Peer support adds the credibility of shared lived experience, role-modelling of recovery, and practical navigation support. These processes complement, rather than replace, individual interventions.

Clinical relevance

Mental health nurses commonly co-facilitate therapy groups and work alongside peer support workers, who are increasingly part of recovery-oriented teams. Understanding group factors and the peer role helps clinicians support these interventions; this description is provided at a reference level and is not guidance for individualized treatment.

Epidemiology

Group formats are widely used because they extend access and harness shared experience, and peer support roles have expanded across many mental health and addiction services as part of recovery-oriented service models.

Evidence & guidelines

A structured evidence review of peer recovery support for substance use disorders found promising but methodologically variable findings, and recovery-oriented frameworks increasingly endorse peer roles. The strength of evidence varies by population and outcome, so current sources should be consulted for practice decisions.

History

Group psychotherapy grew through the twentieth century, with Irvin Yalom's articulation of therapeutic factors becoming a standard reference. In parallel, mutual-aid and self-help traditions and, later, the consumer and recovery movements gave rise to formalised peer support roles, which have been progressively integrated into mental health and addiction services.

Debates

How should peer support be defined and evaluated?

Peer support spans informal mutual aid to formal employed roles, and its diversity complicates evaluation; reviews note promising findings alongside heterogeneity and a need for stronger study designs.

Key figures

• Irvin Yalom
• Molyn Leszcz
• Mike Slade

Seminal works

• yalom-leszcz-2005
• reif-2014

Frequently asked questions

How is peer support different from group therapy?

Group therapy is led by trained clinicians who use group processes therapeutically, whereas peer support is provided by people with their own lived experience of mental illness or addiction, drawing on shared experience and role-modelling rather than professional training.

Why are groups considered therapeutic?

Groups offer factors not available in individual work, such as discovering that others share one's struggles, gaining hope from peers, learning from interpersonal feedback, and benefiting from helping others.