Why hot compresses can relieve pain: I. Hot compresses can make the local capillaries in the blood circulation dilate and relieve pain. Second, it can make the veins dilate and reduce the local pain caused by edema. Third, it can promote the absorption of inflammation and bruising, to achieve the effect of pain relief treatment. Fourth, it helps to reduce inflammation, swelling and accelerate tissue regeneration, and can relieve local pain. But remember not to use too hot temperature hot compress, it will achieve the counterproductive effect, choose the appropriate hot compress. It should be combined with sufficient rest and proper care, not excessive exercise, but also not no exercise, appropriate to do exercises that can assist in wound healing, can accelerate the healing of the wound. If there is discomfort, you should go to the hospital as soon as possible to ask the doctor, or carry out the appropriate examination and treatment.