"Major depressive disorder (MDD) (also known as clinical depression, major depression, unipolar depression, or unipolar disorder; or as recurrent depression in the case of repeated episodes) is a mental disorder characterized by a pervasive and persistent low mood that is accompanied by low self-esteem and by a loss of interest or pleasure in normally enjoyable activities. The term \"depression\" is used in a number of different ways."@en . . "D003865" . "296.3" . "Major depressive disorder"@en . "296.2" . "F32,F33" . . . "608516"^^ . "," . .