Depression.(Issue)

Serious depression, as opposed to the fleeting kind we all feel at times, has definite warning signs. Some or all of these signs may be present within the affected individual. One symptom of depression is a change in sleep patterns- either sleeplessness or sleeping too much. Another sign is abnormal eating patterns, either eating too much or loss of appetite. A third sign is trouble in thinking or concentrating, even yo the point of finding it difficult to read a magazine or newspaper. Finally, a general feeling of hopelessness may signal depression. People feel indifferent to their families and jobs and may begin to think that life is not worth living.
http://psychcentral.com/disorders/sx22.htm