Stimulating nerves with cold or heat can reduce inflammation and pain. Ice packs are handy for the first 24-72 hours after a back injury as they minimize swelling and discomfort. When using packets of frozen vegetables, place a cloth on your skin to avoid ice burn.
Hot packs reduce inflammation and relax tense muscles. Use moist heat in the form of showers, baths, and hot packs for 15-20 minutes at a time for up to three sessions a day. If using electrical heating pads, set a timer in case you fall asleep.