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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.ower back strain is caused by damage to the muscles and ligaments of the back. Learn about muscle anatomy and the symptoms of lower back strain. Back Strains and Sprains Video. A muscle strain or a muscle sprain in the back is the most common cause of back pain.