Psychological disorders involving intense and prolonged shifts in mood. A person with a mood disorder might feel very happy or very sad for long periods of time and for no apparent reason. Because of this, their moods affect they way perceive everything in their daily lives, making it very difficult to function well. There are two main categories of mood disorders; Depressive Disorders (major depression, dysthymia) and Bipolar Disorders (also known as manic depression; mood swings from euphoria to depression).
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