Research shows fibromyalgia is likely a condition of the immune system
New research has shown that many fibromyalgia symptoms are caused by antibodies that increase the activity of pain-sensing nerves throughout the body.
Fibromyalgia
Passive transfer of fibromyalgia symptoms from patients to mice - PubMed
We can “give” fibromyalgia to mice by transferring fibromyalgia patients’ antibodies to them. Symptoms resolve when antibodies are taken away. Strongly suggests fibromyalgia has an autoimmune component.