Sacroiliitis refers to the infection of the sacroiliac joint, the joint which connects the sacrum with the ilium of the pelvis. The likely causes of sacroiliitis include osteoarthritis, wear and tear of joints, trauma, pregnancy and infection in rare cases. In fact, sacroiliitis is a major symptom of several forms of inflammatory arthritis.

Sacroiliitis is characterized by severe pain in the buttocks that can aggravate during early morning or late at