I have muscle spasm, bit swelling and pain on my back (left side). sometimes it radiates to under arm on same side. i am using voltarin emulgel and chlorzoxazone (250 mg). would cold compress be helpful or warm compress in this case?

Low back pain is mostly caused by injury to a muscle (strain) or ligament (sprain). Common causes include improper lifting, poor posture, lack of regular exercise, trauma. While topical NSAIDS may help, oral NSAIDS (ibuprofen or Naproxen) may provide more antiinflammatory effect. Alternate Cold therapy (20 minutes) with a rest (30 min), then Hot therapy (20 min). Continue the muscle relaxant.