What is a “razor back”? Most doctors believe that a “razorback” is a bulging back, with the back sloping from side to side when bent over. This view is incomplete. Take a 15-year-old child with a 30-degree thoracic C-bend convexity to the right as an example, the child’s body is flexible and lying on the bed will not show a bulging back, instead, the back plate is straight and even the thoracic vertebrae are a bit concave, which is also “razor back”. “Razor back” is also called “cut back”, which means that the back is like cut by a knife, and is caused by rib adhesions on the convex side, such as rib adhesions on the left side 1-4, rib adhesions on the right side 5-9, and rib adhesions on the left side 10-12, which will form a distinctive gap between the thoracic 4-5 and thoracic 9-10 vertebrae. 10 vertebrae between the formation of an obvious depression, lying on the bed, up and down to feel, the back is horizontal, the middle section of the thoracic vertebrae slightly concave, which is also razor back, is similar to the “twisted twist” phenomenon of the spine. In addition, high and low back and part of the high and low shoulder symptoms are due to scoliosis, whether it is habitual scoliosis, or idiopathic scoliosis, the unevenness of the back is the more characteristic symptoms of scoliosis.