The posterior thigh muscle soreness may be related to the following causes: 1, there may be excessive fatigue of the posterior thigh muscle, often seen in patients doing a lot of flexion of the knee joint activities, or doing a lot of running, jumping and other activities, often seen in basketball, volleyball, swimming these sports. If you do too much activity, it may lead to soreness here. 2, there may be muscle strain here, for example, the patient did not do warm-up exercises, then do very strenuous activities involving the thigh, it may cause soreness here, and when the patient does leg press, the soreness can be felt significantly increased. 3, there may be peripheral nerve lesions, the soreness in this area may be due to 4, there may also be local muscle spasm, if there is a continuous cold, or the patient has the habit of turning the leg, may cause the muscle spasm, and then cause soreness.