A muscle cramp is an involuntary contraction of a muscle without relaxation afterward. When a muscle contracts involuntarily, it is referred to as a spasm; a forceful and prolonged spasm becomes a cramp.
Symptoms of a muscle cramp include local pain at the site of the cramp, which can be severe, and firmness or tenderness of the involved muscle. The most commonly involved muscle groups are the back of the lower leg/calf, the back of the thigh (hamstrings), and the front of the thigh.
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