what causes muscle pull?
A muscle strain, or pulled muscle, occurs 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 theyâre most common in your lower back, neck, shoulder, and hamstring, which is the muscle behind your thigh. These strains can cause pain and may limit movement within the affected muscle group.