How is seasonal depression (SAD) different from other types of depression?
Seasonal depression, often called seasonal affective disorder or SAD, is a depression that occurs each year at the same time. It usually starts in the fall or winter and ends in spring or early summer. It is more than just “the winter blues” or “cabin fever.” A rare form of SAD, known as “summer depression,” begins in late spring or early summer and ends in fall. For in-depth information, see WebMD’s Seasonal Depression (SAD).