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Chronic Fatigue Syndrome (CFS) is a poorly understood illness and there has been much debate surrounding the definition of the condition.
The exact cause of chronic fatigue syndrome has not been identified. The symptoms vary widely between individuals and there is a lack of epidemiological data on who develops the condition.
Currently, chronic fatigue syndrome cannot be identified by any specific physical symptom or test and diagnosis is therefore based on a pattern of symptoms and the exclusion of other possible causes. This requires a period of patient observation where clinical features suggestive of the condition are assessed over time.
The 2007 National Institute of Health and clinical Excellence (NICE) guidelines recommend that the following criteria should be met in diagnosing chronic fatigue syndrome:
The possibility of chronic fatigue syndrome should be considered if fatigue has the following features:
In addition, one of the following features should be present:
Symptoms that can possibly be caused by other conditions should not be attributed to chronic fatigue syndrome without exploring other diagnoses. Examples of such features include: