What are symptoms of bipolar disorder?

Manic dep.: Manic phases of elation and heightened energy with less need for sleep, alternating with episodes of depression with lack of energy, sadness & changes in appetite/concentration/sleep, along with morbid thoughts.

Mania and depression: Bipolar disorder includes both depression and mania (bipolar 1) or hypo mania (bipolar 2). Bipolar depression is characterized by loss of interest, motivation, and energy, hypersomnia and hopelessness. Mania is characterized by increased energy, decreased need for sleep, grandiosity, and sometimes irritability. Hypo mania is is the same as mania only to a lesser degree.

Bipolar: Bipolar I and bipolar II, In the first, manic phases are more severe, and in the second, depressive phases are more severe. There is also cyclothymia which is a low grade version of bipolar disorder in general, where mood swings are not as severe in either direction, manic or depressive.