Inflammatory low back pain is an early symptom of spondyloarthropathies (including ankylosing spondylitis, psoriatic arthritis, enteropathic arthritis, etc.), but because it is easily confused with mechanical low back pain caused by strain or trauma, it is easily overlooked and many patients delay treatment. Inflammatory low back pain is defined as chronic back pain (>3 months) and at least 4 of the following 5 items are satisfied ① age <40 years ② insidious onset ③ improvement after activity ④ no improvement after rest ⑤ nocturnal pain (improvement when waking up). The difference between mechanical low back pain and inflammatory low back pain is that mechanical low back pain can occur at any age, no family history, sudden onset, usually lasts less than 4 weeks, symptoms worsen after activity, no night pain, pain is limited in scope, pain increases after activity, and immediate phase indicators such as ESR and CRP are mostly normal. In contrast, inflammatory low back pain occurs in men under 45 years of age, there may be a family history, the onset is insidious, the duration of pain is greater than 3 months, the pain is heavy at night, the pain is diffuse, the pain can be reduced after activity, and ESR and CRP can be elevated. Clinical see some ankylosing spine patients have a history of trauma, due to trauma caused by low back pain, think it is caused by trauma, symptomatic treatment, low back pain is not completely relieved, but is not very heavy, activity activities low back pain can be alleviated, so there is no timely diagnosis, until the emergence of low back activity is limited only diagnosed as ankylosing spondylitis, delayed early treatment, so remind everyone if found to have inflammatory The symptoms of low back pain should be seen by a rheumatologist in a timely manner.