The pain in the upper jaw of the mouth is considered to be related to oral ulcers, stomatitis, sinusitis, and so on. 1. Mouth ulcers: the cause of mouth ulcers is not clear, may be genetic factors and dietary factors, may also be due to immune factors, after the disease may lead to the mucous membrane around the mouth congestion, pain, and edema, etc., can be used to improve mouth ulcers. 2. stomatitis: stomatitis is usually caused by bacterial infection, or local mechanical damage, there will be oral mucosal edema, erosion and pain, etc., you can use cotrimoxazole gargle, cotrimoxazole gargle and other drugs gargle, you can also use the open-throat sword spray, watermelon spray and other drugs. 3. Sinusitis: Sinusitis may be due to bacterial infection or the spread of inflammation in neighboring organs, which may cause nasal congestion and runny nose, and if the condition is more serious, it may also lead to inflammation on the local overstimulation caused by pain in the upper jaw of the mouth. You can use budesonide nasal spray, fluticasone propionate nasal spray and other drugs to reduce the local inflammatory reaction, but also need to take metronidazole tablets, amoxicillin capsules and other antibiotic drugs. The use of drugs should be carried out under the guidance of a doctor, pay attention to mouth cleanliness and hygiene during treatment, and rinse your mouth in time after eating.