Feb 10, 2010 13:10
From WebMD, which has a pretty substantial section on depression:
"Major depressive disorder (depression) is not just a temporary mood, and it's not a sign of personal weakness. Depression is a serious medical condition with a variety of symptoms. Emotional symptoms can include sadness, loss of interest in things you once enjoyed, feelings of guilt or worthlessness, restlessness, and trouble concentrating or making decisions. Physical symptoms can include fatigue, lack of energy, and changes in weight or sleep patterns. Additional symptoms of depression may include vague aches and pains, irritability, anxiety, and thoughts of death or suicide."