There are several reasons why you keep burping while brushing your teeth, which may be caused by diaphragmatic spasm, reflux esophagitis and chronic pharyngitis. 1. Diaphragmatic spasm: When brushing teeth, the toothbrush will stimulate the nerves in the throat, causing diaphragmatic spasm, which is usually relieved after brushing teeth. 2. Reflux esophagitis: hiccups in reflux esophagitis are generally associated with gas reflux and diaphragmatic spasm, during which the patient’s stomach acid, pancreatic fluid and bile will be upwardly refluxed, causing nausea and hiccups. 3. Chronic pharyngitis: reflux pharyngitis in chronic pharyngitis, some patients may be accompanied by nausea, hiccups, and even vomiting and other symptoms. If the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, under the guidance of a doctor to clarify the cause and targeted treatment, do not take medication on their own, so as not to delay the condition.