What is affective disorder?

Bipolar disorder, also known as affective disorder, is a common mental disorder. Epidemiological surveys in western developed countries in 1990s showed that the lifetime prevalence of bipolar disorder was 5.5%-7.8%(Angst, 1999). Goodwind et al. (1990) reported that the prevalence of bipolar I was 1%, and the combination of bipolar I and bipolar II was 3%. If periodicity was added. The peak age of onset is 15- 19 years old, most of them are the first depressive episode, and manic or hypomanic episodes often occur after one or more depressive episodes. At present, there is no systematic epidemiological investigation of bipolar disorder in China. In the Hong Kong Special Administrative Region (1993), men 1.5% and women 1.6%.