What is the primary feature of seasonal affective disorder (SAD)?

The primary feature of seasonal affective disorder (SAD) is the occurrence of cycling episodes of depression that are closely aligned with seasonal changes. Individuals with SAD typically experience depressive symptoms during specific seasons, most commonly in the fall and winter months when there is less natural sunlight. This relationship between the onset of symptoms and seasonal changes is a defining characteristic of the disorder, distinguishing it from other mood disorders that do not have such a clear seasonal pattern.

The importance of this seasonal link is emphasized in the diagnosis and treatment of SAD, which can include light therapy as a primary intervention. Understanding this feature allows for targeted therapeutic approaches that are effective in addressing the specific needs of individuals suffering from SAD.