Gastroesophageal reflux cough (GERC): Gastroesophageal reflux (GER) is a physiological phenomenon in infancy and early childhood. The incidence of GER in healthy infants is 40% to 65%, peaking at 1 to 4 months of age and mostly resolving spontaneously at 1 year of age. GERD becomes a disease when it causes symptoms and/or is accompanied by gastroesophageal dysfunction, and the prevalence of GER in children is about 15%. The latest study found only 4 cases of GER in 49 children with chronic cough (8.2%), and the results of the study by Zhao Shunying et al. showed that only 1 out of 50 cases of chronic cough was GER, so there is no definite evidence that GER is a common cause of chronic cough in children in China. The clinical features and diagnostic clues of GERC are: (1) paroxysmal cough, sometimes severe, occurring mostly at night; (2) symptoms mostly appear after eating and drinking and feeding difficulties. Some children have epigastric or subxiphoid discomfort, retrosternal burning, chest pain, and sore throat; (3) In addition to causing cough, infants can also suffer from asphyxia, bradycardia, and an arched back; (4) It can lead to stagnant or delayed growth in affected children.