A lot of people with fm have muscle spasms, particularly in their legs, back and buttocks. One theory suggests that spasms may occur because the muscle tissue is short of oxygen due to reduced blood flow. Another is that the spasms are caused by the reflex reaction of a muscle in a generally painful condition life fm. Another cause of spasms could be muscle microtrauma - the tearing of small muscle fibers. Doctors think that people with fibromyalgia are very susceptible to muscle microtrauma, perhaps because of a genetic predisposition.
Some people have 'restless legs,' which is a condition that lifts or jerks the limbs.
We are hyperirritable to the environment. Eyes may burn or itch, or there may be a sensation of having a small foreign body like a grain of sand in the eye. Dry mouth may also be caused by some medications. An itch may be accompanied by hives or a rash or have no outward sign at all. Mottle skin, especially on the inner arms and thighs, is also seen with fibromyalgia.