Muscle injury, if it is a mild injury, usually 1~2 weeks to heal; if it is a moderate injury, it takes about 4~6 weeks; if it is a severe injury, it may take 3~6 months to heal. 1. Mild injury: If the mild muscle injury, only minor pain or swelling symptoms, no muscle tissue structure changes, does not affect the motor function, generally 1 ~ 2 weeks to heal. 2. Moderate injury: If it is a moderate muscle injury, it is easy to produce muscle tears, which will lead to obvious pain and swelling, and need active treatment, usually need 4~6 weeks to heal. 3. Severe injury: If it is a severe muscle injury, it will produce changes in the muscle structure, causing motor dysfunction, usually need to be surgically repaired, and it will take 3-6 months to heal after surgery.