The most common symptom of sacroiliac joint dysfunction is pain, either in one side of the lower back or in the hip. Pain usually increases when the patient bends, stands after a long period of sitting or reclining, or climbs stairs, and decreases when the patient lies down. Sacroiliac joint dysfunction is diagnosed through physical examination, during which the physician moves the patient's legs and hips into varying positions, and through imaging tests like X-rays or a CT scan. Anesthetic injections may also be used as a diagnostic tool.