bipolar disorder

Definitions

(Noun) formerly referred to as manic-depression; an illness that affects mood and thought processees; characterized by violent and often swift mood swings from deep depression to euphoria, or vice versa; can cause psychosis is some people

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(Noun) This is a disorder but more than one mood disorder makes up the disorder.
The symptoms include:
Mania
Depression
Mixed (Mania cycling to depression and vice versa continually).
Studies suggest that neurobiology can help find the cause of this disorder.