In the diathesis–stress model of psychological disorders, the diathesis usually refers to vulnerability to a medical condition.
According to the diathesis-stress model, the emergence of a psychological disorder requires the existence of a diathesis and stress which then trigger the development of the disorder.
The diathesis-stress model explains how psychological disorders may be associated with each nature and nurture, and the way those 2 elements may act with each other.
The model has been helpful in explaining why some people with biological tendencies to mental illness don't develop a disorder, and why some people living through stressful life circumstances remain psychologically healthy.
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