We usually say, “I sprained my foot.” This is actually an ankle sprain. Ankle sprain is one of the most common sports injuries. Some data show that it accounts for 20% to 40% of all sports trauma. Ankle sprains are mostly overstretching or tearing of the ligaments around the ankle joint, and in serious cases, they can be accompanied by avulsion fracture. Since the ankle joint is an important pivot and load-bearing joint for human movement, its condition directly determines the quality of human life and sports. So, why is the ankle more prone to injury? What should be done after the injury? Will there be any after-effects? Is it just like what many people think, “It doesn’t matter, just rest for a few days”? Why is the ankle prone to sprains? This is due to the function of the ankle joint and its anatomical structure. Ankle joint in plantarflexion, that is, we do tiptoe this action, often feet will be turned inward, that is, the heart of the foot turned inward. Due to the unique anatomical structure of the ankle joint, the ankle joint can not be well matched at this time, and is in an unstable state of “more flexibility, less stability”. Therefore, when we plantarflex the ankle joint, such as walking down stairs, descending a hill, or landing after jumping, if we lose our balance, it is easy to cause the joint to turn inward, which leads to an ankle joint inversion injury, i.e. lateral ankle sprain. Statistics show that lateral ankle sprains account for about 85% of the total number of ankle sprains. At this time, the soft tissues in the ankle joint are squeezed and impacted by cartilage surface damage, synovial membrane swelling, causing swelling and bruising around the ankle joint. If proper treatment is not carried out in time, there will be a decrease in the strength of the lateral support of the ankle joint and a decrease in the proprioception of the joint. In this way, the instability of the ankle joint will be aggravated, and the ankle joint will be easily sprained again, with chronic phase symptoms such as pain, swelling, and unsteady walking, and can cause other joint injuries and a chain reaction. Patients with acute sprains mostly show pain and subcutaneous bruising; severe ones may have synovial or cartilage injuries, which are characterized by swelling and tenderness around the ankle joint and limited ankle movement. When ligament tear or fracture occurs, the pain and swelling are more obvious on the injured side of the ankle or the fracture end. In patients with repeated injuries, the joint capsule tends to be loose and easy to follow cartilage damage, synovitis, bone redundancy and other joint surface injuries, resulting in chronic injury side or extensive pain, tenderness and swelling within the joint, and a sense of insecurity and leg weakness when wearing high heels or walking on uneven roads. Many patients are deeply troubled by this. Acute sprain treatment: 1, the correct use of hot and cold compresses. Sprain in the early stage, the rupture of small blood vessels in the bleeding, then available cold compress (ice), so that the blood vessel contraction coagulation, control the development of the injury. 24 hours later, the rupture of blood vessels bleeding stops, then available hot compresses, prompting the bruises around the sprain to dissipate. 2, simple medication. In the acute stage, you can prepare your own Yunnan Baiyao capsules, panax ginseng tablets for oral use; orthopedic water, safflower oil, Yunnan Baiyao spray for external use, do not do massage; if the pain is obvious, you can use pain medication appropriately. 3, if the sprain is still swollen, pain intense, do not rule out the possibility of fracture, it is recommended to go to the hospital X-ray examination, so as not to miss the diagnosis and treatment.