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 ...

The sacroiliac joint is a joint between ... the nerve root to the sciatic nerve can give off symptoms such as numbness, tingling, burning, pain and aching down the back of the buttock, back ...