Cyclothymia Mood disorders are divided into depressive disorders and bipolar disorders. The most common depressive disorders are major depression and dysthymic disorder. Bipolar spectrum disorders include bipolar type I, bipolar type II and cyclothymia.
Mood disorders are more common in single, divorced and separated people.
There is no correlation with social class. Genetics, family history, personality factors, environmental stress and biological disturbances or imbalance of neurotransmitters all may play a role in the onset of depression. Studies indicate that about one-third of medical residents have a clinically diagnosable depression at some time during their residencies. Major depression is episodic with normal function between episodes. The characteristic symptoms of depression include depressed mood and changes in appetite and sleep.