In general, the pain in the posterior thigh tendon may be caused by muscle strain, lumbar disc herniation, fasciitis and so on. 1. Muscle strain: it is a kind of chronic and repeated accumulation of microscopic injury, due to its chronic injury, which can make the patient appear the situation of posterior thigh tendon pain. 2. Lumbar intervertebral disc herniation: it is a common and frequent disease in spinal surgery, which usually causes patients to suffer from lumbar pain, lower limb pain, aching and tenderness, which can also lead to posterior thigh tendon pain. 3. Fasciitis: it refers to the pathological changes of fascia, which is mainly divided into infectious and aseptic. It is often manifested as muscle pain, muscle tension, movement disorder and so on. In addition, the back of the thigh tendon pain can also be seen in other diseases, it is recommended that the patient consult a doctor in time to avoid delaying the condition.