Seasonal Affective Disorder (SAD) is a type of depression that's related to changes in seasons-SAD begins and ends at about the same times every year. If you're like most people with SAD, your symptoms start in the fall and continue into the winter months, sapping your energy and making you feel moody.
The symptoms of Seasonal Affective Disorder typically tend to begin in the fall each year, lasting until spring. The symptoms are more intense during the darkest months. Therefore, the more common months of symptoms will vary depending on how far away from the equator one lives.