Biopsychosocial formulation

Learning objectives

After this module you should be able to:

Explain the biopsychosocial model and its systems basis.
Identify biological, psychological and social influences on a problem.
Build a formulation using predisposing, precipitating, perpetuating and protective factors.
Evaluate strengths and critiques of the model.

Introduction

George Engel proposed the biopsychosocial model in 1977 as an alternative to purely biomedical thinking. The textbook makes it a unifying theme: physical and mental health problems are best understood through the interaction of biology, psychology and social context. This module turns the model into a practical formulation method.

Approach profile

A consistent ten-part profile is used for every theoretical approach so you can compare them directly.

1 Core assumptions

Health and illness arise from interacting biological, psychological and social systems.
Change at one level can affect others.
Assessment and intervention should consider all three levels.

2 View of psychological difficulty

Problems emerge when vulnerabilities and stressors at multiple levels combine and are maintained by feedback between levels.

3 Explanatory mechanisms

Biological: genetics, neurochemistry, physical illness, medication, sleep, substances.
Psychological: learning, beliefs, coping, emotion regulation, personality.
Social: family, culture, socioeconomic status, discrimination, social support, life events.
Reciprocal effects: psychological stress affects physiology; illness affects mood and relationships.

4 Assessment implications

Medical history and liaison with physicians.
Psychological interview and measures.
Social and cultural context, including stressors and resources.

5 Typical intervention principles

Coordinated, often multidisciplinary plans that target relevant levels — for example medication review, CBT and family or community support.
Health-behaviour change and stress management.

6a Strengths

Comprehensive and humane.
Encourages collaboration across professions.
Fits complex, chronic and comorbid problems.

6b Limitations

Can become a checklist that lists factors without explaining how they interact.
Gives little guidance on weighting factors or choosing interventions.
Critics argue it is too broad to be falsified.

7 Evidence considerations

As a framework rather than a treatment, it is not tested in the way therapies are; its value lies in guiding comprehensive assessment.
Research on stress physiology, health behaviour and social determinants of health supports the interacting influences it describes.

8 Fictional case formulation: Meera, 34 (see case lab) Original, fictional

Meera, a fictional nurse with panic attacks, illustrates the model: shift work disrupts sleep and she drinks a lot of strong tea (biological); she interprets a racing heart as a heart attack (psychological); and she is financially supporting her parents while her husband works abroad (social). Each level feeds the others — poor sleep raises arousal, catastrophic interpretations escalate panic, and worry about missing work increases stress.

9 Comparison with other approaches

How this approach compares (general tendencies; evidence varies by problem)
Approach	Explains difficulty through	Main route to change	Evidence considerations
Biopsychosocial	Interaction of biological, psychological and social systems	Coordinated intervention at whichever levels are relevant	A framework rather than a therapy; widely endorsed, criticised for vagueness
Psychodynamic	Unconscious conflict, early relationships, defences	Insight and working through, often via the therapeutic relationship	Growing evidence for short-term psychodynamic therapy for some problems; long-term analysis is hard to test
Behavioural	Learned associations and consequences in the environment	New learning: exposure, reinforcement, skills practice	Strong support for specific methods such as exposure and contingency management
Cognitive-behavioural	Interaction of thoughts, emotions, behaviour and physiology	Testing and changing unhelpful beliefs and behaviours	The most extensively researched; strong support for many anxiety and depressive disorders
Humanistic	Blocked growth; incongruence between self and experience	Empathy, genuineness and acceptance enabling self-direction	Relationship conditions well supported; fewer controlled trials of pure humanistic therapy
Family systems	Patterns of communication and structure in relationships	Changing interactions, boundaries and family narratives	Support for several family-based interventions; varies by model and problem
Integrative	Multiple interacting influences	Combining theories, common factors or techniques	Depends on what is integrated; hard to test as a single entity
Diathesis–stress	Vulnerability triggered by sufficient stress	Reducing stress, building resilience, addressing vulnerability	Broad support for vulnerability × stress interactions; specifics vary by condition

10 The short knowledge check for this approach appears further down the page.

The 4P formulation grid Original elaboration

A practical way to apply the model is to cross three domains with four types of factor. The grid is a thinking tool, not a form to fill mechanically — the important part is explaining how the factors connect.

The four Ps, examined across biological, psychological and social domains.

Applications in the textbook Textbook concept

The textbook illustrates biopsychosocial thinking with obsessive-compulsive disorder, panic disorder and anxiety, cardiovascular disease (including Type A behaviour and stress) and cancer, showing how biological vulnerability, cognitive and behavioural patterns, and social context together shape onset, course and treatment.

Worked example: Linking, not listing Original, fictional

Weak formulation: 'Biological — poor sleep. Psychological — anxious thoughts. Social — family stress.' Stronger: 'Night shifts reduce her sleep, which raises baseline arousal; she then notices palpitations, interprets them catastrophically and panics; fear of another attack makes her avoid shifts, which threatens income and adds to family stress.'

Summary

The biopsychosocial model integrates biological, psychological and social influences.
The 4P grid organises factors by type and domain.
A good formulation explains interactions, not just lists factors.
The model is a framework; critics note its breadth.

Questions for reflection

Which domain do you tend to overlook when thinking about a person's difficulties?