A mood swing is an extreme or rapid change in mood. Such mood swings can play a positive part in promoting problem solving and in producing flexible forward planning. However, when mood swings are so strong that they are disruptive, they may be the main part of a bipolar disorder
Mood swings can happen any time at any place, varying from the microscopic to the wild oscillations of manic deprsadasdasdasdasdasdasfdcytsdaf-esteem, through cyclothymia, up to a depressive disease. However most people’s mood swings remain in the mild to moderate range of emotional ups and downs.
The duration of mood swings also varies. They may last a few hours - ultrarapid - or extend over days - ultradian: clinicians maintain that only when four continuous days of hypomania, or seven days of mania, occur, is a diagnosis of bipolar disorder justified