Chronic Fatigue Syndrome is a basis for Social Security disability, and Social Security Ruling 99-2p sets forth the policy for evaluating disability claims involving chronic fatigue syndrome.

One of the problems with chronic fatigue syndrome is that no one really knows what causes it. However, the New York Times has a fascinating article today, entitled Is a Virus the Cause of Fatigue Syndrome? 

It is definitely worth reading, and while your on the New York Times site, check out the health quide for chronic fatigue syndrome.