What are the symptoms of influenza？

Flu symptoms are light weight, according to their clinical performance can be divided into four types:
(1) simple: Zheng Jian high fever, chills, headache, stuffy nose, runny nose, such as pharyngodynia.
(2) gastrointestinal type: Zheng Jian nausea, vomiting, loss of appetite, diarrhea and abdominal pain.
(3)-poisoning: Zheng Jian high fever not to delirium, convulsions, coma and even consciousness.
(4) pneumonia-type: Zheng Jian high fever, cough, hemoptysis, short breath, difficulty in breathing, and even respiratory failure.