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Muscle spasm (charley horse)

A muscle spasm also known as a Charley horse typically occurs after vigorous exercise. The affected muscle contracts involuntarily and will not relax. It can occur in any muscle of the body but typically involves the legs, arms and neck. Other causes include dehydration and changes in a person's body chemistry with abnormal levels of minerals. Low blood levels of potassium, magnesium and calcium are the most frequent causes of a Charley horse, but sometimes no cause can be found. More rarely muscle spasms can occur if the nerve supplying the muscle is injured or irritated.

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