Explanations of mood (affective) disorders: depressive disorder (unipolar) — FAQ

Not necessarily. Genetics create a predisposition or vulnerability, not a certainty. The diathesis-stress model suggests that a genetic vulnerability (diathesis) for depression often only manifests when triggered by a significant environmental stressor. Many people with a family history of depression never develop the disorder themselves.

No, they are not. In fact, they likely interact in a complex way. For example, persistent negative thinking (a cognitive factor) could lead to long-term changes in brain chemistry (a biological factor). Conversely, a neurochemical imbalance (biological) could make it harder for an individual to challenge negative thoughts (cognitive). Modern approaches often integrate these explanations for a more holistic understanding.

While it is less dominant in research compared to biological and cognitive models, its concepts have been influential. The idea that early life experiences and loss can create a vulnerability to depression is a central theme in many modern therapies. However, its core mechanisms, like 'anger turned inwards' and regression, are difficult to prove scientifically and are not the primary focus of evidence-based treatments like CBT or medication.