Generally speaking, the causes of children vomiting large mouthfuls of clear mucus include the following: first, the symptoms caused by acute gastritis in children, after children suffer from acute gastritis, often cause vomiting large mouthfuls of clear mucus and stomach pain and other symptoms, children can be given timely antiemetic treatment, such as children can be given the application of Si Mo Tang Oral Liquid or Bao He Wan, etc., when the clear mucus is mostly composed of The clear mucus is mostly composed of gastric acid and damaged gastric mucosa. Secondly, caused by children’s sputum vomiting, after children suffer from respiratory tract infections there will often be a large amount of sputum, this time will also cause the symptom of spitting up a large mouthful of clear mucus, this time the clear mucus is composed of sputum.