Beyond the Biomedical Model
For much of the 20th century, medicine operated under the biomedical model: illness was explained almost entirely by biological causes — pathogens, injuries, genetic malfunctions — with psychological and social factors treated as, at best, secondary. In 1977, physician George Engel proposed the biopsychosocial model as a direct challenge to this narrow view, arguing that health and illness emerge from the interplay of three domains: biological factors (genetics, pathogens, physiology), psychological factors (beliefs, emotions, coping skills, behavior), and social factors (socioeconomic status, culture, relationships, access to care).
Under the biopsychosocial view, the SAME diagnosis can play out very differently in two people depending on their psychological resources and social context — a chronic pain condition, for instance, is shaped not just by tissue damage but by a patient's coping style, their beliefs about pain, and whether they have supportive relationships and stable income.
| Domain | Examples |
|---|---|
| Biological | Genetics, pathogens, physiological state |
| Psychological | Beliefs, emotions, coping skills, behavior |
| Social | Socioeconomic status, culture, relationships, access to care |
This shift also reframed the GOAL of care. The World Health Organization (WHO) defines health not merely as the absence of disease, but as "a state of complete physical, mental, and social well-being" — an explicitly positive standard that only makes sense within a biopsychosocial framework, since well-being clearly depends on more than biology alone.
Common pitfall: treating the biopsychosocial model as simply "biology plus a little bit of psychology thrown in." The model insists the three domains genuinely INTERACT — a psychological state can alter biological processes (e.g. chronic stress raising cortisol), and social conditions can shape psychological states (e.g. isolation raising depression risk) — not that they merely sit side by side.