What are the symptoms of unipolar depression?

Depression: Depressed mood, lack of interest, excessive guilt, sleep disturbance, appetite issues, poor attention span and concentration, lack of energy and suicidal thinking. If you have most of these symptoms for more than two to four weeks, you should talk to some one.

The following: Derpessed or irritable mood, loss of interest, change in sleep habit and appetite, decrease energy, worthlessness/ excessive guilt, decrease concentration, and suicidal thoughts.