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Chronic fatigue syndrome (CFS) is an emerging illness characterized by debi= litating fatigue (experienced as exhaustion and extremely poor stamina), neurologica= l problems, and a variety of flu-like symptoms. The illness is also known as = chronic fatigue immune dysfunction syndrome (CFIDS), and outside of the USA is usua= lly known as myalgic encephalomyelitis (ME). In the past the syndrome has been = known as chronic Epstein-Barr virus (CEBV). The core symptoms include excessive fatigue, general pain, mental fogginess= , and often gastro-intestinal problems. Many other symptoms will also be present, howev= er they will typically be different among different patients. These include: fatigu= e following stressful activities; headaches; sore throat; sleep disorder; abnormal temp= erature; and others. The degree of severity can differ widely among patients, and will also vary= over time for the same patient. Severity can vary between getting unusually fatigued = following stressful events, to being totally bedridden and completely disabled. The s= ymptoms will tend to wax and wane over time. This variation, in addition to the fact tha= t the cause of the disease is not yet known, makes this illness difficult to diagnose.