Bipolar disorder causes extreme mood changes that may disrupt daily life.
As the name suggests, this disorder can make a person experience low episodes called Depression and high episodes called Mania or Hypomania.
Symptoms of manic episodes include showing very high energy in speech and activity, agitation, and a reduced need for sleep.
Symptoms of depressive episodes include low energy and motivation, lack of interest in daily activities and sometimes suicidal thoughts.
Bipolar disorder is a life long disease which can respond well to medicines and other therapies that can help people function well and lead fulfilling lives.
More Info:
https://www.healthdirect.gov.au/bipolar-disorder
https://www.yourhealthinmind.org/mental-illnesses-disorders/bipolar-disorder