Major depressive disorder
Classification and external resources
Depression is common, can affect anyone, and can be treated.
ICD-10	F32., F33.
ICD-9	296.2, 296.3
OMIM	608516
DiseasesDB	3589
MedlinePlus	003213
eMedicine	med/532
MeSH	D003865

Depression (also called major depressive disorder, unipolar depression or clinical depression) is a mental illness. Many people think that depression just means a person is very sad. However, depression can cause many symptoms in the body as well as mood problems.