Bipolar disorder, known in the past as manic depression, is a condition that affects people's moods, which can swing from one extreme to another.
People with bipolar disorder have periods of:
- Depression - where they feel very low and lethargic
- Mania - where they feel very high and overactive
- Les severe mania is known as hypomania
The exact causes of bipolar disorder are unknown and it is relatively common - around one person in 100 is diagnosed with the condition.
More top news
Two police officers face a gross misconduct hearing after stopping at McDonald's before attending an emergency call for a suicidal woman.
International Development Secretary, Priti Patel, urged the rest of the world to 'act now' to help millions of people at risk of starvation.
Nail-biting footage of two thrill seekers climbing to the top of One Canada Square in London's Canary Wharf has emerged online.