Chapter 2 - Section A - Definition

Mayo Clinic:
Fibromyalgia is a chronic condition characterized by widespread pain in your muscles, ligaments and tendons, as well as fatigue and multiple tender points — places on your body where slight pressure causes pain.

Google:
Fibromyalgia is a common condition characterized by long-term, body-wide pain and tender points in joints, muscles, tendons, and other soft tissues. Fibromyalgia has also been linked to fatigue, morning stiffness, sleep problems, headaches, numbness in hands and feet, depression, and anxiety.
Fibromyalgia can develop on its own or along with other musculoskeletal conditions such as rheumatoid arthritis or lupus.

Wikipedia:
(new lat., fibro-, fibrous tissue, Gk. myo-, muscle, Gk. algos-, pain, meaning muscle and connective tissue pain) is also referred to as FM or FMS. Fibromyalgia is characterized by chronic widespread pain and allodynia, a heightened and painful response to pressure. Fibromyalgia symptoms are not restricted to pain, leading to the use of the alternative term fibromyalgia syndrome for the condition. Other core symptoms include debilitating fatigue, sleep disturbance, and joint stiffness. Some patients may also report difficulty with swallowing, bowel and bladder abnormalities, numbness and tingling, and cognitive dysfunction. Fibromyalgia is frequently comorbid with psychiatric conditions such as depression and anxiety and stress-related disorders such as posttraumatic stress disorder. Not all people with fibromyalgia experience all associated symptoms. Fibromyalgia is estimated to affect 2-4% of the population.


What does all of that mean?
Basically that means for people with Fibromyalgia is that it is more difficult for our pain receptors to be turned off. There doesn’t have to be a cause, but stress, bad food, over activity, and/or chemicals can set us off. The weather changing can also cause pain to worsen.