The flu is a contagious infection of the nose, throat, and lungs caused by the influenza virus. It usually begins abruptly, with a fever between 102 and 106°F. (An adult typically has a lower fever than a child.) Other common symptoms include a flushed face, body aches, chills, headache, nausea, and lack of energy. Some people have dizziness or vomiting. The fever usually lasts for a day or two, but can last 5 days. Somewhere between day 2 and day 4 of the illness, the “whole body” symptoms begin to subside, and respiratory symptoms begin to increase. The flu virus can settle anywhere in the respiratory tract, producing symptoms of a cold, croup, sore throat, bronchiolitis, ear infection, or pneumonia. The most prominent of the respiratory symptoms is usually a dry, hacking cough. Most people also develop a sore throat and headache. Nasal discharge (runny nose) and sneezing are common. These symptoms (except the cough) usually disappear within 4-7 days. Sometimes, the fever returns. Cough and tiredness usually last for weeks after the rest of the illness is over.
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