A variety of studies by CDC and others have shown that between 1 and 4 million Americans suffer from Chronic Fatigue Syndrome (CFS). They are seriously impaired, at least a quarter are unemployed or on disability because of CFS. Yet, only about half have consulted a physician for their illness. The earlier a person with CFS receives medical treatment the greater the likelihood that the illness will resolve. Equally important, about 40% of people in the general population who report symptoms of CFS have a serious, treatable, previously unrecognized medical or psychiatric condition (such as diabetes, thyroid disease, substance abuse). CFS is a serious illness and poses a dilemma for patients, their families, and health care providers. This web site aims to provide evidence-based information concerning the illness, its manifestations, and treatment.