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Symptoms

Symptoms of muscle strain include:

  • Muscle pain and tenderness, especially after an activity that stretches or violently contracts the muscle -- Pain usually increases when you move the muscle but is relieved by rest.

  • Muscle swelling, discoloration or both

  • Muscle cramp or spasm

  • Either a decrease in muscle strength or (in Grade III strains) a complete loss of muscle function

  • A pop in the muscle at the time of injury

  • A gap, dent or other defect in the normal outline of the muscle (in Grade III strain)

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