Your sacroiliac (pronounced sa-krow-i-lee-ak) joints are some of the biggest joints in your body because they're where your spine connects to your pelvis. Pain in your sacroiliac joint is a common ...

Sacroiliitis is inflammation of the sacroiliac (SI) joint in the pelvic region of your body. This can lead to symptoms of pain in the lower back and buttocks. Sacroiliitis can be caused by several ...