Acute soft tissue trauma, such as sprains and contusions, can be treated with local ice packs within 24-48 hours to reduce local tissue edema. How long it takes for the swelling to subside depends mainly on the severity of the swelling. Ice can promote local vasoconstriction, reduce local congestion, at the same time can make the blood flow slows down, the viscosity of the blood increases, conducive to blood coagulation and control bleeding, for the local soft tissue injuries in the early stage of a very good effect. If the local soft tissue is slightly swollen due to trauma, the swelling of the patient can subside on its own after 24-48 hours of ice application. If the soft tissue injury is more serious, the local tissue swelling is accompanied by elevated skin temperature, pain, etc., simple ice can only promote local capillary contraction, reduce tissue exudation. For the swelling has formed can not achieve the purpose of rapid reduction, 48 hours after the ice should not be applied, the patient can be based on the situation or the doctor’s advice for massage, massage and other treatments, generally need about 5-7 days of swelling can subside. In addition, ice packs to reduce swelling is recommended within 24-48 hours of the patient’s injury, each ice pack can be 10-20 minutes, and should avoid frostbite.