Ankylosing spondylitis may cause buttock pain. It primarily affects the axial joints, and can be accompanied by extrarticular manifestations. This condition leads to stiffening and deformity of the spine, and it cannot be cured, only managed with medication to slow the progression of the disease, delay joint deformity, improve quality of life, and reduce disability rates. Its clinical manifestations vary widely, and its onset is often insidious. Men are more commonly affected and tend to experience more severe symptoms. The most common symptoms include stiffness in the neck or pain in the lumbar and back areas. However, some people may experience pain in the lower back, accompanied by morning stiffness, or alternating pain in the buttocks, or radiating pain from the groin to the lower limbs. This pain is often worse at night or after prolonged sitting, but symptoms can lessen after activity.