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- Muscle Disorders
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Cramps or Charley Horse
A charley horse, or cramp, is an involuntary, forcibly contracted muscle that does not relax, resulting in sudden and intense pain. Cramps can affect any muscle under your voluntary control (skeletal muscle), and can involve part or all of a muscle, or several muscles in a group. The most commonly affected muscle groups are: back of the lower leg/calf (gastrocnemius), back of the thigh (hamstrings), and front of the thigh (quadriceps).
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