The protrusion of the pubic bone may be caused by several reasons: first, it may be caused by severe malnutrition. If the patient has severe malnutrition, there will be a navicular abdomen, that is, when the patient takes a supine position, the abdomen will have a significant depression downward. At this time, the upper and lower bony protrusions of the abdomen will become very obvious, such as in the upper rib arch, the glabellar process, and in the lower iliac bone, pubic symphysis and other places will become very prominent. Second, due to the special position caused by. For example, the protrusion of this area may be caused when the patient is in the supine position and makes an effort to raise the pelvis. In addition, if the patient is thin, this phenomenon is more obvious. Third, it may be caused by inflammation around the pubic bone, for example, the patient has a contusion of the pubic bone or a separation of the pubic symphysis, due to local aseptic inflammation, which will lead to swelling in this area and thus cause a protrusion. Fourth, due to occupying lesions of the pubic bone, such as in the pubic bone when there is a bone tumor, there may also be a protrusion.