You might think it’s odd that two diseases like myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and fibromyalgia (FM) share the same International Awareness Day, observed on May 12 every year. But the fact is, ME/CFS and FM have too much in common, and usually co-occur.

What they have in common
According to a study published in QJM: An International Journal of Medicine in 2013, both ME/CFS and FM are “medically unexplained illnesses, predominantly of women, characterized by disabling fatigue and by widespread pain with tenderness, respectively.” Since these diseases often co-occur and have a similar psychogenic process of symptom amplification (the psychological tendency to misconstrue the significance of normal physical sensations like pain or fatigue), many researchers and medical professionals consider them to be a single syndrome instead of two separate ones.
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