Ankylosing spondylitis should be highly suspected in patients younger than 40 years of age, especially in men, who present with symptoms of lumbar stiffness and difficulty bending over. The local symptoms of ankylosing spondylitis often manifest as lumbosacral pain, which is often vague and sometimes occurs after exertion or injury; sometimes patients feel a stiffness in their lower back in the morning that is relieved by activity; sometimes it manifests as inflammation of tendons and ligamentous bone attachment points such as heel pain, and about half of the patients may also show asymmetric peripheral joint inflammation and muscle pain. The subsequent remission period is often free of clinical symptoms and can sometimes last for several years, especially in women. The symptoms of ankylosing spondylitis include: 1. low back discomfort that appears insidiously, lasts for weeks or months, may be accompanied by morning stiffness, worsens with rest, and improves with activity. 2. 2. Asymmetric large arthritis of the lower extremities. 3.The appearance of heel pain, plantar pain, and hip pain. 4.Ocular uveitis with or without arthritis (an easily recurring, recurrent eye disease that severely impairs vision). 5.Limited anterior curvature, scoliosis and retroversion of the spine. 6. Restriction of thoracic extension. For younger male patients with one of the main symptoms mentioned above, further examination should be done; for those who suffer from intractable iritis with one of the above symptoms, the disease should be suspected and should be seen in a timely manner for early diagnosis and treatment.