Generally, depression is classified into three main categories:
Major Depression: This is an episode that lasts longer than two weeks and exhibits at least five of the seven following symptoms: Sleep alteration, decreased interest in activities, feelings of guilt, decreased energy, difficulty concentrating, alteration in appetite, thoughts of suicide. One common symptom: early-morning awakenings (we're talking 3:30 am, not 5:15 am when the alarm clock buzzes at 5:35 am anyway).
Situational Depression: This describes an episode that lasts longer than two months with the above symptoms, but comes after a person has suffered a significant life change, such as bereavement or retirement. Importantly, your symptoms improve with time since the major event, so most therapists feel that your long-term functioning is better if you can manage to get through this without drugs.
Vascular Depression: This is depression that commonly occurs after a brain or blood-vessel disorder, such as a stroke, or after a heart attack or heart surgery. Patients with lesions in the left hemisphere of the brain, especially of the left prefrontal cortex, tend to have increased frequency and severity of depression. The greatest risk period of depression following a stroke appears to be the first two years afterward, peaking within the first three to six months.
Find out more about this book:You: Being Beautiful - The Owner's Manual to Inner and Outer Beauty