Low back pain is a common and frequent disease that endangers people’s health and is very common in clinical practice. There are more systems involved and more departments to consult, so sometimes it is not very easy to confirm the diagnosis. Briefly described as follows: 1, mechanical (structural: that is, we generally say structural low back pain, mainly refers to muscle injury, osteoarthritis, disc herniation and other mechanical factors caused by low back pain. 2, rheumatological: common are ankylosing spondylitis, rheumatic polymyalgia, leukodystrophy, psoriatic arthritis and so on. 3, endocrine / metabolic: osteoporosis, osteochondrosis can cause low back pain, especially parathyroid, thyroid disease. 4, neurological/psychological: for example, neuropathic arthritis, depressive psychosis, etc. can also cause low back pain. 5. Infectious: For example, some infections of the local structure of the low back, such as infection of the vertebral body, septic sacral hip arthritis, and herpes zoster can also cause low back pain. 6, neoplastic/infiltrative: including giant cell tumor, localized hemangiopericytoma, and some others, such as multiple myeloma of the blood, can cause low back pain. 7, mixed: such as Paget’s disease, retroperitoneal fibrosis, and vertebral body sarcoma, etc. 8, related diseases: such as vascular, gastrointestinal, and genitourinary diseases can also cause low back pain.