A psychological theory posits that mental disorders develop from a combination of a predisposition to the illness (diathesis) and stressful environmental conditions. The diathesis can take the form of genetic factors, personality traits, or early childhood experiences, while the stress component encompasses significant life events, trauma, abuse, or other environmental stressors. An individual with a strong predisposition may only require a small amount of stress to trigger the disorder, whereas someone with a weak predisposition might withstand significant stress without developing a mental illness. For example, an individual genetically predisposed to depression may not develop the disorder unless triggered by a significant job loss or the death of a loved one.
This framework is valuable because it highlights the interaction between nature and nurture in the development of psychological disorders. It avoids the limitations of purely biological or purely environmental explanations, offering a more nuanced understanding of mental health. Historically, it emerged as a reaction to reductionist models that overemphasized single causes of mental illness, promoting a more holistic approach to diagnosis and treatment. The benefit lies in its application to create personalized prevention and intervention strategies by identifying individuals at risk and mitigating the impact of stress.
