The lumbar coccyx is also clinically known as the sacrococcygeal tail. Sacrococcygeal pain may be caused by physiological factors such as sedentary activities and exposure to cold, or it may be caused by pathologic reasons such as lumbar disc herniation and ankylosing spondylitis. 1. Physiological factors: the sacrococcygeal area belongs to the lumbar vertebrae and caudal vertebrae, and the ligaments around it are relatively loose, which may cause the tension and spasm of the soft tissues around the joints when sitting for a long period of time; it may also cause the long-term pressure on the sacrococcygeal area, which affects the local circulation, and both of them may cause the symptoms of lumbar coccygeal soreness; the sacrococcygeal area, which has been exposed for a long period of time to the outside and is subjected to cold, may also show the above mentioned symptoms. 2. Pathological factors: the sacrococcygeal area belongs to the lumbar 5 sacral 1 intervertebral disc, which is prone to lumbar intervertebral disc herniation or bulging, resulting in compensation and fatigue of the soft tissues around the vertebral body, narrowing of the vertebral body gap and even direct compression of the spinal nerve roots or spinal cord nerves, resulting in the pain in the sacrococcygeal area; ankylosing spondylitis may also affect the sacrococcygeal area and give rise to the above mentioned symptoms. There may be other reasons for the pain around the waist, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.