Bipolar disorder is a chronic mental health condition characterised by distinct episodes of mania and depression. It occurs in approximately 1-2% of the population with the highest prevalence in young adults. If not properly treated, the condition may have a significant impact on the relationships, career and self-esteem of those affected. The exact cause of bipolar disorder is not clearly understood and may involve a combination of factors including family history, genetics and environmental triggers. Overlapping anxiety disorder is thought to occur in around 60% of those affected and approximately 25-30% of sufferers also report alcohol or substance abuse.