<unk>  is associated with more instances of relapse than depression that is responsive to<unk> . One study showed that as many as 80% of people with<unk>  who needed more than one course of<unk>  relapsed within a year.<unk>  has also been associated with lower long-term quality of life. Another study saw just 8 of 124 patients in remission after two years of regular<unk>  with therapy and medicines.
Treatment-resistant depression
Long-term depression
Recurrent brief depression
Outline of bipolar disorder
Chronic hallucinatory psychosis
Double depression
Mass psychogenic illness
Late life depression