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A muscle strain, or pulled muscle, is when your muscle is overstretched or torn. This usually occurs as a result of fatigue, overuse, or improper use of a muscle. Strains can happen in any muscle, but are most common in your lower back, neck, shoulder, and hamstring (the muscle behind your thigh).his usually occurs as a result of fatigue, overuse, or improper use of a muscle. Strains can happen in any muscle, but are most common in your lower back, neck, shoulder, and hamstring (the muscle behind your thigh).
Muscle strains, also called pulls, occur when the small fibers within a muscle are stretched beyond their limits, which results in a partial or complete tear (rupture). All muscle pulls are categorized as either Grade I (tearing of a few fibers), Grade II (more extensive fiber damage) or Grade III (complete rupture).