Bipolar disorder - previously known as manic depression - is a condition that affects your moods, which can swing from one extreme to another. If you have bipolar disorder you will have periods, or ‘episodes’, of depression and mania.

Both extremes of bipolar disorder have a number of other associated symptoms. Unlike simple mood swings, each extreme episode of bipolar disorder can last for several weeks or longer. The high and low phases of the illness are often so extreme that they interfere with everyday life.

The depression phase of bipolar disorder often comes first. Initially, you may be diagnosed with clinical depression before having a manic episode some time later (sometimes years later), after which your diagnosis might change. During an episode of depression, you may have overwhelming feelings of worthlessness which often lead to thoughts of suicide.

During a manic phase of bipolar disorder, you may feel very happy and have lots of ambitious plans and ideas. You may spend large amounts of money on things that you cannot afford. Not feeling like eating or sleeping, talking quickly, and becoming annoyed easily are also common characteristics of bipolar disorder.

During the manic phase, you may feel very creative and view mania as a positive experience. However, during the manic phase of bipolar disorder, you may also have symptoms of psychosis (where you see or hear things that are not there).