

Although the exact percentages are not known, it is thought that about 50 percent of people with chronic fatigue syndrome (CFS or CFIDS) will recover and that most will recover within the first five years after experiencing the initial symptoms of CFS. However, the chronic fatigue syndrome prognosis varies considerably among people. While some patients recover to the point where they can resume work and other activities, other patients continue to experience various or periodic chronic fatigue syndrome symptoms. Chronic fatigue syndrome often follows a cyclical course, alternating between periods of illness and periods of well-being.
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