Ankylosing spondylitis cannot be self-tested, patients need to combine their own symptoms to make an initial judgment, and then confirm the diagnosis through laboratory tests, imaging tests and other tests. Ankylosing spondylitis is a chronic inflammatory disease that involves the spine, sacroiliac and other joints, and patients mainly manifest pain and stiffness in the lower back or buttocks. If the patient’s pain persists for 3 months, the pain improves after activity, the pain is not relieved after rest, the lumbar spine flexion, extension and lateral flexion activities are limited, or the range of thoracic extension is smaller than the normal value for the same age, it is necessary to be alert to ankylosing spondylitis. When the above symptoms appear, patients need to go to the hospital for laboratory tests, imaging tests and physical examination, of which X-ray examination is the most commonly used diagnostic method for ankylosing spondylitis, which is characterized by blurring of the sacroiliac joint surfaces, irregular edges, etc. MRI examination has a higher sensitivity to early sacroiliac arthritis, and it can improve the diagnostic accuracy. If you suspect that you have ankylosing spondylitis, you should go to the Department of Rheumatology and Immunology of the local regular hospital, and undergo the relevant examinations for clear diagnosis and early treatment.