Mood swing

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A mood swing is an extreme or rapid change in mood.

This may occur as part of the normal variation in emotion or may be of clinical severity, enough to be regarded as a mood disorder the classic example of which is bipolar disorder (also known as manic depression).

Other causes of mood swings are:

hormonal changes that can temporarily upset brain chemistry, such as during PMS, perimenopause, menopause or puberty. As the hormones involved normalize, these mood swings generally subside on their own.