What does the diathesis-stress model propose is essential for developing a disorder?

The diathesis-stress model posits that the development of psychological disorders occurs as a result of an interplay between inherent vulnerabilities (diathesis) and environmental stressors. This model emphasizes that a genetic or biological predisposition alone is not sufficient to cause a disorder; rather, it requires the presence of specific environmental factors or stressors that activate or trigger the underlying vulnerability.

For instance, an individual may have a genetic predisposition for a condition such as depression but may never develop the disorder unless faced with significant life stress, such as a traumatic event or chronic stress. These stressors act as catalysts, bringing forth the potential for the disorder to manifest.

This understanding highlights the importance of considering both individual vulnerabilities and external circumstances when assessing mental health and the development of psychological disorders.