The pain in the right side of the thigh can have several causes: first, inflammation of the lymph nodes in the groin, which can lead to enlarged lymph nodes in the groin and often requires anti-inflammatory medication to relieve the pain. Second, synovitis, synovitis can lead to fluid in the hip joint and lead to pain at the root of the thigh, which often requires an MRI to further confirm the diagnosis. Third, femoral head necrosis, femoral head necrosis can occur in the root of the thigh or chronic pain gradually aggravated, especially in weight bearing pain is more obvious, then often need to carry out CT and nuclear magnetic examination to further confirm the diagnosis. Fourth, hip impingement syndrome, when the hip joint has a bone spur or abnormal development of the femoral neck, resulting in hip impingement syndrome can also appear in the root of the thigh pain, often a palm-sized pain on the front side of the hip, then it is necessary to carry out x-ray and nuclear magnetic examination to further confirm the diagnosis.