Bipolar disorder is sometimes confused with depression, but it's a very separate condition.

Bipolar disorder, also called manic depression, affects one in ten people who suffer from depression, about one or two per cent of the population.

Characterised by extreme mood fluctuations between excited, overconfident hyperactive behaviour and deep depression, some people also experience hallucinations or delusions.

People feel euphoric and important during the manic phase, talking quickly, often irritable and angry, their sex drive can soar. While they are often shocked at their behaviour afterwards, many feel that a manic state is creative and valuable. This is followed by devastating misery and shame, often with severe depression symptoms and suicidal thoughts.
Some people experience years of stability in between only a few episodes, while others have cycles more often.

Bipolar disorder usually affects people (men and women equally) in their 20s or 30s, although some teenagers are affected.

There is no definite cause of bipolar disorder, but you may be more likely to suffer from it if you have experienced a period of extreme stress, early abuse or trauma, or overpowering problems.

More on Depression:

Understanding Depression – The stats, signs and symptoms

Depression and Teens – Depressed people are getting younger and younger

The Causes of Depression – Causes, treatments and what to do if you’re depressed

Your Mental Health: When It’s Not Just Depression – Bipolar Disorder

Depression and Addiction – How depression is linked to drinking and drugs