Sacroiliac joint pain may be caused by physiological phenomenon or diseases, such as: sacroiliac arthritis, ankylosing spondylitis, trauma, tumors and so on. 1. Physiological phenomenon: pregnant women in late pregnancy may press the local nerve leading to sacroiliac joint pain. Generally no treatment is needed. 2. Sacroiliac arthritis: acute and chronic inflammation of the joints caused by various reasons will stimulate the bone as well as the joint cavity, resulting in sacroiliac joint pain. It should be treated with rest and anti-inflammatory and analgesic drugs such as ibuprofen and celecoxib. 3. Ankylosing spondylitis: it is a chronic inflammatory disease of its own, mainly sacroiliac joint pain as the first symptom, accompanied by lumbago, morning stiffness and so on. You can cooperate with Meloxicam, Celecoxib and other drugs to alleviate the symptoms, and at the same time, cooperate with methotrexate, thalidomide and other drugs to treat. 3. Trauma: local trauma stimulation may also lead to sacroiliac joint pain. Mild trauma generally pay attention to rest, most of them will recover on their own. Serious trauma needs to be treated by surgery and other measures. 4. Tumor: Tumor in the sacroiliac joint can also cause sacroiliac joint pain. Surgery is usually needed to remove the tumor. Sacroiliac joint pain, there may be other reasons, you need to go to the hospital in time for examination, to clarify the cause of the disease and follow the doctor’s instructions for treatment. The use of drugs need to follow the doctor’s advice.