Influenza refers to a group of diseases characterized by cough, sore throat, and fever following upper respiratory tract infection by influenza virus. However, influenza has its peculiarities. Apart from respiratory symptoms, influenza can also present with nausea, vomiting, and even abdominal pain and diarrhea. Thus, it is entirely possible for influenza patients to experience vomiting.

However, due to some doctors' lack of understanding of influenza, the vomiting caused by influenza is often mistaken for acute gastroenteritis or treated as acute gastritis. This can lead to inappropriate medication use, resulting in prolonged illness. Therefore, if a patient has fever, nausea, vomiting, or sore throat, it is crucial to promptly consider the possibility of influenza to avoid delaying the diagnosis and treatment.