When a muscle is strained, if the strain is relatively mild, it can recover on its own after rest; if the strain is more severe and the deep fascial tissues have been torn, it cannot recover on its own. Muscle strain refers to part of the muscle fibers in the process of activity to withstand the tension is too large and tearing. Currently, muscle strains can be categorized into three grades in the clinic. Grade I injuries are less serious and can only be seen under a microscope, and can usually heal on their own after rest. Secondary and tertiary injuries are more serious, more muscle fibers are broken, even fascia may be torn, pain is obvious, and in severe cases, the muscle function of the strained area has been lost, and need to actively seek medical treatment. When you feel the muscle strain should stop activities, rest, if necessary, need to use a brace to temporarily immobilize the affected limb, to prevent the injury from aggravating, if you can not determine the extent of their own strain, you should go to the orthopedic department as early as possible, by the doctor to help determine the condition and treatment, in order to avoid delaying the optimal recovery time.