The main purpose of elevation after foot sprain is to promote venous blood return to the distal limb, because after the trauma, the local soft tissue injury of the foot will affect the blood circulation of the distal foot and aggravate the swelling, there is obvious pain, and even if the swelling is too slow to subside, it is easy to secondary venous thrombosis of the lower limb. Therefore, in the acute phase of the injury can choose the method of foot local ice, ice wrapped in a towel and applied to the foot sprain injured parts, with the role of swelling and pain relief. And the patient should pay attention to bed rest, not strain, lower limbs can not droop, can be appropriate for local activities or muscle contraction exercise, to promote local venous return. If the angiography of the lower limb confirms the occurrence of thrombosis, it should be actively anticoagulated, because the embolism is easy to complicate pulmonary embolism, which can cause serious complications, so the foot sprain must be elevated.