What is major depressive disorder?
Major depression is the most common form of depression. It is sometimes called major depression, clinical depression, unipolar depression or simply 'depression.' Major depressive disorder is typically when one has a low mood and/or loss of interest and pleasure in usual activities. Other symptoms can be a factor in depression and most of these symptoms will last for at least two weeks. Depression can be described as mild, moderate or severe. Severe cases of depression are either melancholia or psychotic.