Pain in the upper jaw of the mouth when swallowing saliva may be caused by foreign body irritation, or it may be triggered by stomatitis, mouth ulcers and other factors. 1. Foreign body stimulation, the pain of swallowing saliva in the upper jaw of the mouth may be the result of eating too hard food in the process of eating, causing stimulation to the upper jaw of the mouth, resulting in mucous membrane breakage, and thus the symptoms. 2. Stomatitis, some patients with stomatitis due to inflammation of the oral cavity stimulation, inflammatory secretions increase, the mucous membrane of the upper jaw of the oral cavity erosion, foreign body stimulation may appear in the upper jaw of the oral cavity pain when swallowing saliva symptoms. 3. Mouth ulcers, patients with mouth ulcers, due to the oral cavity has been damaged, if again stimulation may lead to pain symptoms. If the number of pain is more frequent, it is recommended to consult a doctor in time for examination and treatment.