In clinical practice, the hamstring tendons behind the knee mainly refer to the muscles of the popliteal fossa, including the semitendinosus and semimembranosus muscles. As the human knee joint needs frequent flexion and extension, weight-bearing activities or cold, it is easy to have damage to the semitendinosus and semimembranosus muscles, which can cause changes in the toughness and elasticity of the ligaments, making the patient feel pain and swelling in the popliteal fossa area and affecting the activities. In the treatment, you can give external plasters for bruising damage, or use orthopedic fumigation of Chinese medicine, and also take oral bruising drugs, which can make the muscle tissue damage in the popliteal fossa area, and get recovery as soon as possible. In the popliteal area is also prone to cysts, which can compress the surrounding nerves and blood vessels, causing local numbness or muscle weakness of the lower limbs.