Depression is a mental condition characterized by prolonged series of poor moods, loss of interest and enjoyment in ordinary activities, and low energy, all of which contribute to varying degrees of social and vocational dysfunction. Depression is a chronic condition that affects a person's ability to work, quality of life and, in extreme circumstances, can lead to suicide. For the last few years, depression has been the leading cause of disabilities among people. There are several types of depression. Seasonal Affective Disorder, Persistent Depressive Disorder, Atypical Depression, Bipolar Disorder, Major Depression, Postpartum Depression, Premenstrual Dysphoric Dis...