A muscle strain is the stretching or tearing of muscle fibers. In mild cases, only a few muscle fibers are stretched or torn, and the muscle remains intact and strong. In severe cases, however, the muscle may be torn and unable to function properly.
Doctors often classify muscle strains depending on the severity of the damage:
Grade I strain - Mild strain; only a few muscle fibers are stretched or torn. Although the injured muscle is tender and painful, it has...
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