Temporomandibular joint disorder

Temporomandibular joint disorder (TMJ) is a co-morbid of ME/CFS. The Institute of Medicine report lists it as an "Additional Symptom".

"Temporomandibular joint disorder (TMJ) causes jaw pain, and it's more common in people with Fibromyalgia (FMS) and Chronic Fatigue Syndrome (CFS or ME/CFS) than it is in the general population."