The cause of bilateral sacroiliac joint dense osteitis is not clearly concluded so far, it is presumed that it may be related to infection, trauma, strain, and in women, it may be related to pregnancy, these causes will lead to ischemic changes in the sacroiliac joint, which will result in sacroiliac joint hyperplasia and sclerosis, and patients will have pain in the lumbosacral region, sometimes radiating to the buttocks and legs. The treatment of sacroiliac joint dense osteitis is mainly based on conservative treatment, including local protection, braking and rest, which can be taken as support, symptomatic treatment and physical therapy, mainly for local analgesia, anti-inflammation and blood circulation. The prognosis is generally good. If there is intractable pain in the sacroiliac joint and conservative treatment is ineffective, fusion surgery of the sacroiliac joint can be performed.