Manic depression---also known as bipolar disorder---is a mood disorder that causes you to swing between episodes of depression and mania. According to the Mayo Clinic, certain behaviors and characteristics might indicate bipolar disorder.

Signs of Mania

During a manic episode, you might experience feelings of euphoria, and increased optimism and self-esteem. You often exhibit poor judgment, engage in risky behavior and make poor choices regarding finances. You tend to talk very quickly and have racing thoughts, and may become easily agitated and aggressive.

Signs of Depression

The depressive phase often brings feelings of sadness, guilt, hopelessness and anxiety. You might have trouble sleeping and eating, fatigue, decreased interest in activities or suicidal thoughts and behavior.

Other Considerations

Other possible symptoms of manic depression include weather-based mood changes, having at least four episodes of mood swings in a year or psychosis, says the Mayo Clinic.

Children

Children usually do not manifest the same symptoms as adults. Your child might be bipolar if he has an extremely bad temper, rapid changes in mood and reckless or aggressive behavior. Different sleeping patterns can also indicate a problem.

Seeing a Doctor

If you suspect you have manic depression, see a doctor or mental health professional as soon as possible. This condition will not just go away--you need lifelong treatment to manage symptoms.

Source:

The Mayo Clinic: Bipolar Disorder