Bipolar Disorder usually begins in the late adolescence (often appearing as depression during the tenn years), Although it can start in early childhood or later in life. An equal number of men and women develop this condition ( men tend to begin with an episode of mania, women with an episode of depression), and it is found among all ages, races, ethnic groups, and special classes. Bipolar disorders tend to run in families and appear to have a genetic link. 

(Bipolar High) Manic symptoms include heightened mood, exaggerated optimism and self-confidence, excessive irritability, aggressive behavior, decrease need for sleep without experiencing fatigue, grandiose thoughts, racing speech, racing thought impulsiveness, poor judgement, reckless behavior and easily distracted.

(Bipolar low)Depression symptoms inclides prolonged sadness or unexplained crying spells, sleep patterns, irritability, anger, worry, agitation, loss of energy, persistent lethargy, social withdrawal, and recurring thought of death or suicide.

Anxiety disorders can also mimic depression, with symptoms ranging from trouble concentrating, restlessness and irritability to fatigue and difficulty sleeping.

The classic signs of depression include feelings of sadness, hopelessness, and worthlessness, but some people with depression also feel restless or irritable, have trouble concentrating, and sleep either too much or too little. Other people may experience fatigue and dramatic changes in appetite.