When sports cause knee pain, you need to apply ice instead of heat. When a sports injury occurs that causes knee pain, ice is the right treatment option. Ice can significantly reduce the exudation of interstitial fluid, reduce the inflammatory response, especially reduce the infiltration of inflammatory cells, thus reducing the secretion of inflammatory mediators, and reduce the damage of inflammatory mediators to the articular cartilage, but also significantly reduce the degree of swelling of the joint. Hot compresses, on the contrary, will increase the degree of inflammatory response, and will increase the degree of swelling of the limb.