Chronic fatigue syndrome (CFS) is a disorder characterized by extreme fatigue or tiredness that doesn’t go away with rest and can’t be explained by an underlying medical condition. CFS can also be referred to as myalgic encephalomyelitis (ME) or systemic exertion intolerance disease (SEID). The causes of CFS aren’t fully understood yet. Some theories include viral infection, psychological stress, or a combination of factors. Because no single cause has been identified, and because many other conditions produce similar symptoms, CFS can be difficult to diagnose. There are no tests for CFS. Your doctor will have to rule out other causes for your fatigue when determining a diagnosis.
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Journal of Cancer Biology and Clinical Oncology 