Overview. 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.
Sadness is an emotional state characterized by feelings of unhappiness and low mood. It is considered one of the basic human emotions. It is a normal response to situations that are upsetting, painful, or disappointing. Sometimes these feelings can feel more intense, while in other cases they might be fairly mild.