<unk>  <unk>  defines a mental disorder characterized by intermittent depressive episodes, not related to menstrual cycles in women, occurring between approximately 6–12 times per year, over at least one year or more fulfilling the diagnostic criteria for major depressive episodes (DSM-IV and ICD-10) except for duration which in<unk>  is less than 14 days, typically 5–7 days. Despite the short duration of the depressive episodes, such episodes are severe, and suicidal ideation and impaired function is rather common. The majority of patients with<unk>  also report symptoms of anxiety and increased irritability. Hypersomnia is also rather frequent. About 1/2 of patients fulfilling diagnostic criteria for<unk>  may have additional short episodes of<unk>  hypomania which is a severity marker of<unk> .<unk>  may be the only mental disorder present, but<unk>  may also occur as part of a history of<unk>  major depressive episodes or bipolar disorders.<unk>  is also seen among some patients with personality disorders.
Recurrent brief depression
Long-term depression
Treatment-resistant depression
Psychological effects of Internet use
Double depression
Associated features of bipolar disorder
Outline of bipolar disorder
Depression in childhood and adolescence