Symptoms of influenza are usually categorized into simple type, gastrointestinal type, pneumonia type, poisoning type and so on. 1. Simple type: Simple type influenza usually has a rapid onset of symptoms such as chills, high fever, headache, dizziness, generalized body aches, and fatigue. 2. Gastrointestinal: Patients with gastrointestinal influenza may have gastrointestinal symptoms such as loss of appetite, abdominal pain, bloating, vomiting and diarrhea. This type is more common in children. 3. Pneumonia: Pneumonia type influenza symptoms are more serious, patients can have obvious cough, cough sputum, dyspnea and other symptoms, and severe respiratory failure can occur. 4. Toxicity: Toxic influenza patients are mainly systemic toxemia symptoms are more obvious, such as repeated high fever, hoarseness, headache, chest tightness, dyspnea, convulsions, etc., and the serious cases can be diffuse intravascular coagulation, circulatory failure, shock, and even death. After suffering from influenza, you need to go to the hospital in time to check the specific degree and treatment, so as not to delay the condition.