Hot compress is a kind of physical therapy, which mainly has the function of dilating blood vessels, improving local blood circulation and promoting local metabolism. Hot compresses generally refers to the use of hot towels, hot water bags and other therapeutic equipment with a heating effect or hot compresses such as drugs, direct treatment of the affected area of a physical therapy, which mainly has the effect of vasodilatation, improve local blood circulation, promote local metabolism, but also relieve muscle spasms, and promote the absorption of inflammation and bruising, clinically commonly used in the treatment of soft tissue injury diseases. It should be noted that, for patients suffering from acute inflammation, dermatitis, thrombophlebitis and wounds in the affected area, freshly healed skin, loss of the ability to distinguish between hot and cold (such as some diabetic patients) and other patients, can not be blindly hot compresses, and hot compresses during the period of aggravation of the condition, or other discomfort, but also should be immediately stopped and consult a doctor.