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Muscle pain is common. Fibromyalgia occurs in 2 percent of the general population (in 0.5 percent of males and 1.5 percent of females) and is diagnosed in approximately 15 percent of patients seen in rheumatology clinics and up to 10 percent of those seen in general internal-medicine clinics. Low back pain, which in many cases is of myofascial origin, has a lifetime prevalence as high as 80 percent and accounts for 20 million sick days per year in the United States. Twenty percent of persons in the general population have chronic regional pain. Nocturnal muscle cramps are common in all
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