A 9-year-old child with diarrhea 2 days after influenza fever is considered to have a combination of intestinal viral infection and intestinal dysfunction. Influenza is an upper respiratory tract infection caused by influenza virus infection, and the child may have a combination of intestinal virus infection, which may be followed by digestive dysfunction such as nausea, vomiting, and diarrhea after high fever. In addition, there may be intestinal dysfunction such as dysbiosis due to influenza, which may also lead to diarrhea. Influenza fever for 2 days began to diarrhea, parents must pay attention to, not blindly use anti-diarrhea drugs, first need to seek medical attention to clarify the cause of diarrhea, in the diarrhea should pay attention to replenish water and electrolytes to avoid dehydration.