Gastrointestinal flu is mainly caused by coxsackievirus, adenovirus and other viruses infecting the upper respiratory tract, accompanied by bacterial infections, which can cause gastrointestinal symptoms, systemic symptoms and khat symptoms, etc., as follows. 1. Gastrointestinal symptoms: caused by the flow of viruses and bacteria to the gastrointestinal tract through saliva. Patients may experience nausea, vomiting, abdominal distension, abdominal pain and diarrhea. A large amount of vomiting and diarrhea will cause electrolyte disorders, dehydration, etc. It is necessary to pay attention to fluid rehydration and electrolyte balance to prevent shock. 2. Systemic symptoms: common systemic symptoms are fever, fatigue, muscle pain and loss of appetite. 3. Catarrhal symptoms: mostly related to upper respiratory tract mucosa and nasopharyngeal involvement. Patients show cold symptoms such as cough, nasal congestion and runny nose, which are generally self-limiting. It is recommended that patients with gastrointestinal colds seek timely medical treatment and choose appropriate treatment under the guidance of doctors.