The pain in the hip is also the pain in the sacroiliac joint, which generally has the following causes: first, sacroiliac arthritis, sacroiliac arthritis can be seen in patients who get cold and strain, when the pain in the sacroiliac joint can appear, early x-ray and CT examination of the sacroiliac joint should be performed to make a diagnosis, on the x-ray and CT examination, it can be seen that the sacroiliac joint has an obvious increase in bone density, and in serious cases, there will be joint Second, dense osteoarthritis, dense osteoarthritis is mostly seen in women, after pregnancy and childbirth, sacroiliac joint lesions, then CT examination can see the sacroiliac joint serious bone density increase, local obvious percussive pain, serious cases can be radiated to the root of the thigh, then the relevant CT, nuclear magnetic examination to carry out early diagnosis and treatment; third The third, rheumatoid diseases and ankylosing spondylitis, when rheumatoid involvement of the spine can appear sacroiliac joint pain, ankylosing spondylitis patients often sacroiliac joint pain as the first symptom, gradually spread upward, then early blood tests and sacroiliac joint x-ray, spinal x-ray examination, to carry out early diagnosis and treatment.