How long it takes for a muscle strain to heal depends on the severity of the muscle injury, about 1 week in mild cases and 2-3 months in severe cases. If the muscle strain symptoms are relatively mild, only local pain, generally rest for about 1 week can be effective relief. If the strain is severe and the patient has significant local swelling and bruising, it will take longer to repair, usually at least 1 month. If the strain is close to the joint area, resulting in serious muscle or even ligament damage, the recovery time will be longer, it may take 2-3 months to fully recover; at the same time, the ligament strain also requires external fixation treatment with a plaster cast for a period of time, and after the removal of the plaster cast, the patient also needs to carry out progressive muscle and joint rehabilitation training. In short, patients with muscle strains must pay attention to adequate rest, standardized treatment and rehabilitation training to help rapid recovery.