People with this condition may first develop symptoms during childhood, adolescence, or as young or older adults. Many people do not have any symptoms. Those with symptoms typically have only rapid fatigue, cramps or muscle pain (myalgia) after exercising. In some cases, symptoms may progress over the first few years, but then the condition usually stabilizes (does not get worse). In many people, it is not progressive at all.There are no known consistent complications of the condition.There is no evidence of muscular dystrophy or muscular wasting in affected people, and it does not affect smooth muscle or other organs (only skeletal muscle). Life expectancy is not shortened.
Last updated: 3/4/2015
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