There are many reasons for sacroiliac joint disorder, mostly related to long-term exercise, scoliosis, ankylosing spondylitis and other factors. 1. long-term exercise: long-term exercise can cause long-term strain on the sacroiliac joints, and repeated injuries can lead to sacroiliac joint disorders. 2. scoliosis: prolonged sedentary activities, improper sitting posture, etc. can lead to prolonged improper stress on the lumbosacral spine, and the sacroiliac joints are in an improper force structure for a long time, which leads to wear and tear of the articular surfaces, and consequently, disorders of the sacroiliac joints. 3. Ankylosing spondylitis: Some of the early imaging manifestations of ankylosing spondylitis may also show sacroiliac joint disorder. Sacroiliac joint disorder may also have other causes such as trauma, etc. If pain and other uncomfortable symptoms occur, you should go to the hospital in time, improve the examination to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.