Clinical symptoms of leg strains can vary depending on the degree of strain, but mostly pain is the main manifestation. It can be manifested as pain in leg muscles such as quadriceps muscle of anterior thigh, biceps femoris muscle, semimembranosus muscle, semitendinosus muscle of posterior thigh, and suture muscle of medial side of the leg, etc. Especially during activities, such as stirring the leg, walking, adducting, abducting, extending, etc., pain of varying degrees will occur. Within 24 hours of injury, the pain will be particularly severe, the above muscles can also be accompanied by different degrees of tissue edema caused by pressure pain, severe numbness of the thigh, individual can be accompanied by the buttock muscles at the same time pain, edema, mainly related to muscle spasm caused by neurological symptoms. Clinical signs of dysfunction may also occur, such as the inability to exercise a certain angle of movement, but mostly due to pain and the inability to carry out a certain position of movement.