By Adrienne Dellwo in About Health
Fibromyalgia (FMS) and chronic fatigue syndrome (ME/CFS) are difficult illnesses to classify. Both have a broad range of physical symptoms that span multiple systems, and they’re associated with multiple psychological symptoms as well. In addition, they’re often accompanied by a slew of other illnesses — many of which are also hard to classify.
As scientists are getting more of a handle on FMS, ME/CFS and other related illness, an umbrella term that’s more frequently used to describe them is central sensitivity syndromes, or CSS. Some researchers argue that this term should replace other terms, such as functional somatic syndrome, medically unexplained syndrome, and somatoform disorders, because they believe CSS is more accurate.
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