Strains often occur in the lower back and in the muscle in the back of the thigh.
Symptoms include pain, swelling, muscle spasms, and limited ability to move the muscle.
Treatment may include pain relievers, ice, or splinting.
Consult a doctor for medical advice
Sources: Mayo Clinic and others.
More than 3 million US cases per year
Lab tests or imaging rarely required
Short-term: resolves within days to weeks