For the first 24 hours following an injury, cold compresses should be applied to reduce swelling and relieve pain. Then a warm compress should be applied 20 minutes on and 20 minutes off. Warmth soothes and relaxes aching muscles. It increases blood circulation at the affected area, which triggers the body's healing mechanism. Heat therapy decreases strain-related muscle spasms and inflammation. Therapeutic warmth delivers oxygen and vital nutrients to appropriate body cells, getting rid of toxins and fostering healing. Heat helps relieve pain. It won't be necessary to give your kid over the counter pain relievers, like acetaminophen.