Saliva increase after infusion, generally and infusion does not have much to do with, may be related to poor oral hygiene, oral mucosal disease, gastroesophageal reflux and other factors. 1. Poor oral hygiene: the temperature and humidity in the oral cavity are more suitable for bacterial reproduction, and the food debris and sugar substances on the teeth and tooth surface are easy to occur in dental caries, and under these undesirable stimuli, it will cause increased salivation. 2. Oral mucosal disease: if the patient has herpes stomatitis, oral ulcers and other related diseases, it is possible that because of the local stimulus, thus the phenomenon of increased salivation, which is more obvious after the infusion. 3. Gastroesophageal reflux: patients may be due to the esophagus anti-reflux defense function decreased, thus gastroesophageal reflux, there will be increased drooling, epigastric pain, belching (hiccups) and other related symptoms, and infusion is not related. It is recommended that patients should pay attention to the increase in saliva after infusion, can cooperate with the doctor to improve the relevant examination to determine the cause and then deal with it.