As the name suggests, the illness has two poles: Depression and Mania. Bipolar Disorder is a condition which cause abnormal changes in the mood: from extreme elation to depression. This illness occurs in episodes and the patient may be relatively normal in the intervening period.
The aim of treatment is to prevent episodes of depression or mania and reduce the severity and frequency of episodes. So many patients may require life long therapy with mood stabilizers, aiming to help patients be in better control of their illness and lead a normal life as far as possible.