The part connected with the waist and hip is mainly the sacroiliac joint, and the common causes of pain in this part are as follows: 1. osteoporosis caused by aging and degeneration, osteophytes, degeneration, and thus the corresponding pain symptoms. 2. visible in dense osteitis, due to dense osteitis leads to sclerosis of the sacroiliac joint, narrowing of the joint space, thus producing inflammatory stimulation, and pain symptoms will appear. 3. The patient’s painful symptoms can be seen in the early stages of ankylosing spondylitis, in which sacroiliac arthritis is the main manifestation. 4, acute injury, chronic strain, can also lead to local soft tissue aseptic inflammation, soft tissue damage, resulting in the appearance of painful symptoms. It is recommended that patients go to the hospital for examination in a timely manner to clarify the diagnosis and then carry out the corresponding treatment.