Bipolar Disorder (I & II), formerly called manic depression, causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression).  

 

Manic episodes may include symptoms such as high energy, reduced need for sleep, and loss of touch with reality. Depressive episodes may include symptoms such as low energy, low motivation, and loss of interest in daily activities.

 

Mood episodes last days to months and may also be associated with suicidal thoughts.