Symptoms of bipolar disorder are dramatic and unpredictable mood swings. Mania symptoms may include excessive happiness, excitement, irritability, restlessness, increased energy, less need for sleep, racing thoughts, high sex drive, and a tendency to make grand and unattainable plans. Depression symptoms may include sadness, anxiety, irritability, loss of energy, uncontrollable crying, change in appetite causing weight loss or gain, increased need for sleep, difficulty making decisions, and thoughts of death or suicide.
http://www.webmd.com/bipolar-disorder/guide/bipolar-disorder-symptoms-types