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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).
Pulled Muscle. Causes. A pulled muscle is usually caused by a sudden, uncoordinated movement. A pulled muscle occurs when the muscle fibres and the surrounding connective tissue are overstretched, leading to the damage of individual muscle cells. A pulled muscle is therefore a tiny rupture of the muscle.