The main common clinical reasons for pain inside the jaw are as follows. First, multiple oral ulcers, oral ulcers are large and multiple will cause localized infection, causing obvious pain in the jaw. Patients can gargle with salt water, oral metronidazole tablets, watermelon cream tablets to kill bacteria in the oral cavity, to promote the slow healing of ulcers, thus reducing the symptoms of pain in the jaw. Second, the patient inadvertently fell during strenuous exercise, resulting in a fracture of the jaw, can cause localized intense swelling and pain. At this time, the patient needs to improve the X-ray and CT examination to clarify the specific situation of the fracture. If necessary, surgery should be performed as soon as possible to relieve the pain and swelling of the jaw and promote the early recovery of the patient’s condition.