<unk>  is a mood disorder that falls on the depression spectrum.  It is characterized by the lack of enjoyment or pleasure, clinically referred to as anhedonia, that continues for an extended period.<unk>  differs from major depression in that it is both longer-lasting and not as distressing. The symptoms of<unk>  are often underestimated by the patients and misdiagnosed by clinicians.<unk>  can have a substantial impact on an individual's life by preventing effective functioning, disrupting sleep patterns, and interfering with activities of daily living (ADLs). It usually presents with mild symptoms on a day-to-day basis. Progressively, the disorder may take a more severe form, resulting in work impairment, social isolation, and high rates of suicide. Due to its chronicity and lesser severity, most of the patients suffering from<unk>  believe that it is a part of their character and do not seek treatment until it gets extremely disabling.
Dysthymia
Euthymia 
Cyclothymia
Atypical depression
Panic disorder
Bipolar disorder
Munchausen syndrome
Disruptive mood dysregulation disorder