NCIt synonyms : Major Depression; Major Depressive Disorder;
NCIt definition : A mood disorder having a clinical course involving one or more episodes of serious
psychological depression that last two or more weeks each, do not have intervening
episodes of mania or hypomania, and are characterized by a loss of interest or pleasure
in almost all activities and by some or all of disturbances of appetite, sleep, or
psychomotor functioning, a decrease in energy, difficulties in thinking or making
decisions, loss of self-esteem or feelings of guilt, and suicidal thoughts or attempts.;