When the sacroiliac joints become inflamed or irritated, it can cause lower back pain and stiffness. This is known as sacroiliitis. In some cases, the pain may also radiate into the hips, buttocks, or ...
Sleeping on the side of the affected joint may worsen sacroiliac joint pain (SJP). Lying on the back or using pillows to support the body, such as placing a pillow between the legs, can help to ...