Right hamstring pain can be caused by osteoarthritis of the knee, posterior meniscus angle injury and popliteal cyst. 1. Osteoarthritis of the knee joint: osteoarthritis of the knee joint in the elderly can appear in the posterior interstitium of the knee joint inflammatory reaction, stimulated by the inflammation can lead to pain in the posterior joint capsule and the surrounding soft tissues, resulting in the manifestation of hamstring pain. 2. Posterior meniscus injury: due to trauma, sports injuries, strain injury and other causes of posterior meniscus injury, can be in the knee joint gap behind the popliteal fossa in the performance of pain, bending the knee squatting action when the pain symptoms can be aggravated, squatting is difficult to get up on their own. 3. Popliteal cyst: the deep bursa of popliteal fossa is enlarged or the bursa of knee joint expands backward, which can cause swelling of leg fossa and tendon pain, and the cystic swelling can be touched at the leg fossa, which can easily lead to the limitation of knee extension and flexion activities. When the symptoms of right hamstring pain appear, you should consult a doctor in time, and under the guidance of a specialist, you can actively take appropriate treatment to help alleviate the discomfort of hamstring pain and other symptoms as soon as possible.