Muscle strain is another name for a pulled muscle. It occurs when a muscle is overstretched and tears. Symptoms of a pulled muscle may include pain, swelling, weakness, and difficulty or inability to use the muscle. Muscles in the quadriceps, the calves, hamstrings, groin, low back, and shoulder are the most common sites for pulled muscles. Minor muscle strains resolve with RICE -- Rest, Ice, Compression, and Elevation. Nonsteroidal anti-inflammatory drugs (NSAIDs) may help manage pain and swelling as well. More serious muscle strains require evaluation and treatment by a doctor.