Fibromyalgia syndrome (FMS) is a difficult-to-diagnose condition involving the muscles. It is associated with widespread muscle aches, tenderness, and stiffness along with fatigue and sleep disorders in the absence of neurologic abnormalities or any other known cause. The disorder may coexist with other chronic diseases, may follow a viral infection, and may involve immune system dysfunction. Treatments for FMS may include a carefully planned exercise program and medication with pain relievers, muscle relaxants, or antidepressants.
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