There may be several reasons for the soreness of the inner thigh root: 1, diseases of the hip joint, when the hip joint has femoral head necrosis, impingement syndrome, inflammatory diseases such as osteoarthritis or rheumatoid, gout, tuberculosis, bacterial infection and resulting in inflammation of the hip joint, there will be soreness of the inner thigh root, and hip x-ray and nuclear magnetic examination will be performed for diagnosis and treatment. 2, diseases of the knee joint, when the knee joint When there is a tumor or osteoarthritis in the knee joint, some patients can have soreness in the inner thigh as the first symptom, which is often misdiagnosed as hip joint disease, but in fact it is the knee joint disease that causes soreness in the inner thigh. 3, diseases of the perineum, when there is a tumor or inflammation in the perineum, it can also lead to soreness in the inner thigh, so go to the appropriate specialist for examination and diagnosis.