Introduction
Myalgic Encephalitis/Chronic Fatigue Syndrome (ME/CFS) has had multiple names and criteria over the years since it was first described in 1988. It was originally called chronic fatigue syndrome alone. The prevalence has ranged depending on the case definition criteria used. With the commonly used CDC case definition in 1994, the prevalence of ME/CFS is approximately 0.895%.1 There are two to three times as many women as men impacted with this disorder. Up to twenty other diagnostic criteria have been developed, including the Canadian Criteria updated in 2011-2012 to the International Consensus Criteria.2









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