The reasons for regurgitation and vomiting after eating vermicelli are as follows:1. It may be related to the vermicelli with a hanging white block, which is a chemical raw material, also known as carving white powder, combined with formaldehyde and sodium bisulfite and then reduced to produce, prohibited to add in the food, which begins to decompose harmful substances in water above 60 ℃, and when it is greater than 120 ℃, it decomposes into formaldehyde, sulfur dioxide, and hydrogen sulfide and other poisonous gases, and it will cause headache, weakness, nausea, and vomiting. Nausea, nausea, vomiting, prolonged exposure may lead to nasopharyngeal cancer. 2, to consider whether with eating greasy, too spicy or corrupt food, induced acute gastroenteritis may be. When the above discomfort symptoms appear, immediately seek medical treatment for systematic examination and give treatment under the guidance of doctor.