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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).
1 A muscle strain happens when the muscle is over-stretched or torn, resulting in damage to the muscle fibers (also called a pulled muscle). 2  A lumbar sprain happens when ligaments are stretched too far or torn. 3  Ligaments are very tough, fibrous connecting tissues that connect bones together.here are two common types of lower back strain: 1  A muscle strain happens when the muscle is over-stretched or torn, resulting in damage to the muscle fibers (also called a pulled muscle).