What is a "mood disorder"?

What is a "mood disorder"?

Christopher Reist (Academic Psychiatrist, Co-Author of “Psychiatry”) gives expert video advice on: How do I know if I need treatment for depression?; What are common treatments for depression?; Can I prevent my sadness from developing into depression? and more...

Mood disorder refers to a number of specific mental illnesses that are characterized by certain mood states. For example, major depression is comprised of episodes of depression -- of serious depression. <a href="http://www.videojug.com/interview/bipolar-disorder">Bipolar disease</a>, in contrast, is comprised by episodes of both depression as well as mania or hypomania, which are two kinds of euphoric mood states.