Depression Depression - The Invisible Disease by The National Institute of Mental Health Depression is a serious medical illness. In contrast to the normal emotional experiences of sadness, loss, or passing mood states, clinical depression is persistent and can interfere significantly with an individual's ability to function. Symptoms of depression include sad mood, loss of interest or pleasure in activities that were once enjoyed, change in appetite or weight, difficulty sleeping or oversleeping, physical slowing or agitation, energy loss, feelings of worthlessness or inappropriate guilt, difficulty thinking or concentrating, and recurrent thoughts of death or suicide. Major depression often begins between ages 15-30 or even earlier.
Episodes typically recur.
Many people with dysthymia also have major depressive episodes. While unipolar major depression and dysthymia are the primary forms of depression, a variety of other subtypes exist. Depression can be devastating to all areas of a person's everyday life, including family relationships, friendships, and the ability to work or go to school. Because of these inaccurate beliefs, people with depression either may not recognize that they have a treatable disorder or may be discouraged from seeking or staying on treatment because of feelings of shame and stigma. Too often, untreated or inadequately treated depression leads to suicide.