If you feel depressed for days at a time, can’t get yourself to carry out normal activities, and your sleep patterns and appetite have changed, it’s important that you see your doctor. To diagnose SAD, your doctor will conduct a physical exam, as well as a psychological exam to check for signs of depression.
Your doctor will look for seasonal patterns, such as depression that begins and ends during specific seasons every year, and no episodes of depression during the season in which you experience a normal mood.