Pregnancy is possible with dense osteitis of the sacroiliac joint, and the disease itself does not affect pregnancy. Dense osteitis of the sacroiliac joint usually occurs on the articular surface between the ilium and the sacrum, and can occur unilaterally in the sacroiliac joint or bilaterally at the same time. The main feature of the disease is the increased density of the bone. The disease is usually not serious, and the symptoms usually disappear or go into remission after half a year or a few years, and it does not affect the woman’s pregnancy. The cause of dense osteitis is not clear, but may be related to pregnancy, childbirth, trauma and infection, and labor injury. Especially during childbirth, the ligaments around the pelvis are lax, affecting the stability of the sacroiliac joints, which may lead to damage to the sacroiliac joints. Meanwhile, the pulling of the ligaments may also affect the blood flow of the sacroiliac joints, leading to a decrease in the local blood supply and the emergence of dense osteochondritis.