This joint can be a source of pain like any other joint, and it may cause hip, low back, or buttock pain. Sacroiliac joint dysfunction may also be associated with radiation of pain into the groin and/or back of the thigh. Symptoms may worsen with sitting, standing, sleeping, walking, or climbing stairs. Often the SI joint is painful sitting or sleeping on the affected side. Some people have difficulty riding in a car or standing, sitting, or walking too long. Pain can be worse with transitional movements (going from sit to stand), standing on one leg or climbing stairs.