Article in English: Most calf strains are minor injuries and self-heal within a week -- the degree of pain, disability and bruising are good indicators of seriousness. Grade I muscle strains involve micro-tears of up to 10% of the muscle fibers. They're characterized by mild pain twinges at the back of the lower leg, usually in the mid to proximal (closer to the knee) region of the leg. Minimal loss of strength and motion is experienced. You may still be able to walk, run or play your sport, albeit with discomfort and tightness.  Muscle strains occur when the force in the muscle is so great that the tissue tears, most commonly at the junction between where the muscles taper into tendons. Most Grade I lower leg strains cause discomfort for between two to five days post injury, but may take a few weeks to fully heal, depending on proportion of muscle fibers involved and the type of treatment sought. treatment protocol. The most effective treatment protocol for most sprain / strain injuries is abbreviated R.I.C.E. and stands for rest, ice, compression and elevation. The first step is rest — temporarily stop all activity in order to address your injury. Next, cold therapy (ice wrapped in a thin towel or frozen gel packs) should be applied to the injury as soon as possible in order to stop any internal bleeding and reduce inflammation, preferably while your leg is elevated on a chair or stack of pillows (which also combats inflammation). Ice should be applied for 10 –15 minutes every hour, then reduce the frequency as the pain and swelling subside over the course of a few days. Compressing the ice against your injury with a compression bandage or elastic support will also help stop the bleeding from the torn muscle fibers and associated inflammation. Don't tie the compression bandage too tight or leave it on for more than 15 minutes at a time because complete restriction of blood flow could cause more damage to your leg. Your family doctor may recommend anti-inflammatories such as ibuprofen, naproxen or aspirin, or possibly regular...

Summary in Chinese:
确定拉伤的严重程度。 运用R.I.C.E疗法。 服用非处方药。 做小腿拉伸练习。 做这些练习有时会使病情恶化，延长康复时间，一定要先咨询医生或理疗师。