<unk> , also known as<unk>  depression, is a mood disorder that does not meet the full criteria for major<unk>  disorder but at least two<unk>  symptoms are present for a long time. These symptoms can be seen in many different psychiatric and mental disorders, which can lead to more specific diagnoses of an individual's condition. However, some of the situations might not fall under specific categories listed in the Diagnostic and Statistical Manual of Mental Disorders.<unk>  is an example of one of these nonspecific diagnoses, as it is a disorder classified in the DSM-IV-TR under the category<unk>  Disorder Not Otherwise Specified (DD-NOS). The classification of NOS<unk>  disorders is up for debate.<unk>  as a term was never an officially accepted term, but was listed in Appendix B of the DSM-IV-TR. This is the only version of the DSM that contains the term, as the prior versions and the most recent edition, DSM-5, does not mention it. A person is considered to have<unk>  if they experience 2 to 4<unk>  symptoms, with one of them being either depressed mood or loss of interest or pleasure, during a 2-week period. The person must not have experienced the symptoms for 2 years and there must not have been one specific event that caused the symptoms to arise. Although not all cases of<unk>  are deemed in need of treatment, some cases are treated similarly to major<unk>  disorder. This treatment includes cognitive behavioral therapy (CBT), anti-depressant medication, and combination therapy. A lot of research supports the notion that<unk>  is an early stage of major<unk>  disorder, or that it is simply highly predictive of subsequent major<unk>  disorder.
Minor depressive disorder
Late life depression
Outline of bipolar disorder
Double depression
Major depressive episode
Atypical depression
Depression 
Major depressive disorder