diathesis-stress model

The diathesis-stress model explains how mental health issues develop by recognizing two factors: a person's underlying vulnerability (diathesis) and external stressors. The vulnerability could be genetic, biological, or psychological predispositions. When a person with this vulnerability encounters significant stress—such as trauma, loss, or life changes—it can trigger the onset of mental health problems. Essentially, the model suggests that mental health conditions arise from the interaction between inherent susceptibilities and environmental pressures, rather than from either factor alone.