is when a person is in a melancholy state. In the Encyclopedia Americana is defined as a normal response to a sense of loss, “but when the is unrelated to any actual event or is grossly excessive in portion to its apparent cause, then it reflects some form of mental illness" (747). It is very unclear whether is produced by the psychological experience or by the chemical imbalance in the brain. These unexplained factors involving the cause of , and the wide range of effects that produces, make it a sophisticated mental illness to diag ....