Jaw bulge is an abnormal protrusion of the jaw bone. Bone lesions in the jaw can lead to jaw bulge. The bones and muscle tissue that make up the upper and lower parts of the mouth. The upper part is called the upper jaw and the lower part is called the lower jaw. The bone of the jaw is the jawbone, which is divided into the maxilla and mandible. Internally, there is the Hi-ghmori sinus (maxillary sinus), which opens on the medial side. Among the four projections, the frontal, zygomatic, and palatal projections, each is connected to a bone mass of the same name, and the alveolar process has a tooth socket, which contains the maxillary teeth. The human maxilla is composed of a combination of the narrow maxilla and the premaxilla, between which there is an opening for the incisive canal (stensen’s canal) that connects the nasal cavity to the oral cavity. Evolutionarily, both bones emerged from scleractinian fish, and in the maxilla of planktivorous fish, there is a movable connection between the palatine cartilage, which belongs to the first gill arch, and the cerebral cranium. When a patient has diseases such as jaw enameloblastoma and maxillofacial osteomegaloblastoma, the patient may present with symptoms of jaw expansion. The diagnosis of the jaw should first be made by understanding the cause, the site of direct injury and the history of the injury, then by examining the local and systemic signs, and by referring to the above clinical features to determine the presence or absence of fracture, the site and type of fracture. When conditions allow, further X-ray and CT examinations can be performed to understand in detail the site, number, direction and displacement of the fracture line. It should be emphasized that the examination should be exhaustive and should not miss the diagnosis of multiple injuries of the maxillofacial region and multiple injuries of the whole body to provide an adequate basis for the development of a complete treatment plan.