Depression is a psychiatric syndrome consisting of dejectd mood, psychomotor retardation, insomnia and weight loss, sometimes associated with guild feelings and somatic preoccupations, often of delusional proportions.
Depression is an alteration of mood characterized by sadness, worry, anxiety and loss of weight, libido and enthusiasm as well.
There are several typs of depression such as:
Reactive (Secondary) Depression
It occurs in response to a real stimuli, e.g grief, illness, etc or in response to drugs, e.g. antihypertensive drugs, alcohol, hormones.
Endogenous (Major Depression) Depression
It is a genetically determined biochemical disorder manifested by inability to cope with ordinary stress.