Pain at the root of the thigh can be seen in a variety of diseases such as periarthritis, infection and tumor, as follows: 1, soft tissue injury: generally it may be due to exogenous factors or external forces such as strain, exertion, cold stimulation, excessive exercise, etc., which cause soft tissue injury on the outside of the hip, thus producing pain; 2, infection: mainly seen in inguinal lymphadenitis, chronic pelvic inflammatory disease, herpes zoster and other related diseases, all of which can 3, hip joint diseases: including hip joint injury, hip arthritis, hip periarthritis or chronic inflammation of the hip such as bursitis, broad fasciitis and pyogenic myositis, which can lead to pain at the lateral thigh root; 4, high lumbar disc herniation: can lead to compression of the sciatic nerve, which can cause radiating pain at the thigh root; 5, iliotibial bundle friction syndrome: the iliotibial bundle starts from the iliac crest and ends at the lateral tibial condyle downward. It is the thickest fascia in the whole body, and when the injury is caused by excessive exercise, trauma and other factors, the pain at the root of the thigh, especially the posterior side, can occur; 6. Fracture between the femoral trochanter: the pain is more severe after the fracture and can be radiated to the root of the thigh; 7. Tumor: tumors can occur in various tissues such as muscles, nerves and blood vessels in the thigh area, invading the surrounding tissues and muscles and causing pain at the root of the thigh, such as femoral Primary tumor and metastatic cancer, the latter such as ovarian cancer metastasis, prostate cancer, soft tissue tumors, etc.; 8, pregnancy: with the gradual increase of the uterus during pregnancy, pelvic congestion, can cause thigh root pain.