Ankylosing spondylitis (AS) is a chronic progressive inflammatory disease that primarily affects the spine and can involve the sacroiliac joints and peripheral joints to varying degrees.AS is characterized by inflammation and ossification of the spinal joints and ligaments of the lumbar, cervical, and thoracic segments, as well as the sacroiliac joints. It is estimated that about 30,000 to 50,000 people in China suffer from stiff spondylitis. Since the early onset of the disease is similar to general joint pain, patients often turn to the doctor without success, delaying the disease and causing physical and mental suffering. As medical research continues to advance and clinical standards improve, most ankylosing spondylitis can be relieved and cured with non-surgical treatment. Diagnosis of ankylosing spondylitis (1) lower back pain lasting for 3 months, relieved by activity and not relieved by rest; (2) limited movement in three directions of lumbar scoliosis and forward flexion and extension, with reduced chest expansion compared to the normal age group; (3) bilateral grade II-III sacroiliitis or unilateral grade II-IV sacroiliitis; (4) history of lumbar spine pain or history of present illness; (5) fourth rib thoracic mobility less than 2.5 cm. Diagnostic criteria Unilateral grade II-III or bilateral grade II-IV sacroiliitis and at least one of the five clinical criteria Or unilateral grade II-IV sacroiliac arthritis, or bilateral grade II sacroiliac arthritis and item 2 plus clinical criterion 5 will confirm the diagnosis of ankylosing spondylitis. If bilateral grade II-IV sacroiliac arthritis is present without the above clinical diagnostic criteria, ankylosing spondylitis may be present.