An ankle sprain, a joint injury caused by overstretching the tissues around the ankle joint, is usually accompanied by internal bleeding, meaning that the surrounding skin is not ruptured, but the tissues around the joint (such as tendons, ligaments or their attachment points to the bones) are damaged, with severe cases of ligament rupture accompanied by rupture of small blood vessels and internal bleeding. At this point pain signals are rapidly transmitted to the brain, and if walking continues, the painful stimulus becomes more intense. Acute ankle sprains, men mostly occur in improper sports, acute injuries caused by unstable feet, such as basketball happens when jumping and landing on the feet of teammates or opponents, leading to ankle inversion resulting in soft tissue strains on the outside of the ankle, confrontational sports are very easy to cause ankle injuries. 48 hours first aid treatment: 1, when sprained, then immediately stop the movement, so that the injured ankle to get rest. Protect the injured part to avoid re-injury. 2. Apply ice (ice pellets or small ice cubes in a plastic bag) to the injured part for 20-30 minutes, and repeat every 2 hours for 24 hours or when the pain appears. If the sprain is severe, ice treatment should last 24 to 48 hours. Cold compresses can help constrict blood vessels, reduce blood flow to the injured area, reduce internal bleeding, fluid accumulation or bruising, and ease pain. If there is no ice nearby with cool water for 15 to 20 minutes, so that the injured part of the thorough cooling. 3.Wrap a bandage around the sprained area to secure the ice pack. After the ice pack is removed, still apply a bandage around the area to secure the ankle and reduce possible movement, but not too tight to reduce swelling. 4. Elevate the affected limb as much as possible when possible so that the local blood returns in time to reduce stasis and swelling. Caution: 1. When an ankle sprain occurs during exercise, do not exercise with the injury, as this will aggravate the ankle injury, accelerate the speed of swelling and affect the rehabilitation process in the future. 2, within 48 hours after the ankle sprain or within a week after a serious sprain, do not rub safflower oil or hot compress, which will also cause the capillaries at the injury to expand and accelerate the exudation, making the swelling more serious and detrimental to the ankle rehabilitation.