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Bipolar affective disorder is a psychiatric illness characterised by extreme mood swings. Like a pendulum, the mood of those affected swing from highs of extreme excitement (mania) to lows of depression. In a manic state, the person might be overly happy or agitated, go on a spending spree, party excessively while in a depressive state the person might sleep for very long hours, experience undue fatigue and be sad, unhappy and suicidal. This disorder is extremely hard to diagnose. However there are a number of pointers and signs which can help you know if you or your loved one may be suffering from it.