Depression, a serious medical illness that involves the brain, it is a disorder of the brain. Depression usually starts between the ages of 15 and 30. There are a variety of causes, including genetic, environmental, psychological, and biochemical factors. Some symptoms can include sadness, change in weight, difficulty sleeping or oversleeping, energy loss, feelings of worthlessness, loss of interest or pleasure in activities you used to enjoy, and thoughts of death or suicide. Depression is a serious kind of mental illness that should be treated as soon as possible, before something undoable happens. Usually when depression reaches it climax the…