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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 are classified by a grade scale from one to three. Grade 1 strains are microtears that allow full functionality. They are caused by minor trauma, such as a hard workout. When you experience muscle soreness, you have a grade 1 strain. Grade 2 strains are more detrimental to the functionality of a muscle. This is a partial tear to the muscle, causing a noticeable decrease in strength output. When you experience muscle pain beyond normal aches and soreness, you likely have a grade 2 strain.