People who feel sad over a long period of time and for no explainable reason may have a mood disorder. this is a disorder in which a person undergoes changes in mood that seem inappropriate or extreme. one of the most common mood disorders is bipolar disorder. this illness is known for its mood cycles. a person with bipolar disorder may experience alternating high and low periods. during the high periods the person can have increased energy. during the low periods energy slows down drastically. the symptoms that come with the depressive side of bipolar disorder also occur in major depression. major depression is a very serious mood disorder in which people lose interest in life and can no longer find enjoyment in anything. everyone feels sad from time to time. having occasionally brief periods of sadness does not mean you have a mental or emotional disorder. sharing your feeling with a parent or trusted adult can .

which of the following statements is not a characteristic of mood disorders?
select one:
a. having occasionally brief periods of sadness
b. can never find enjoyment in anything
c. always have periods of no energy
d. totally lose interest in life