Generally speaking , flu is an infection that causes fever, chills, cough, body aches, headaches, and sometimes earaches or sinus problems. The flu is caused by the influenza virus
Many people misinterpret a bad cold or respiratory infection with the flu. With the flu, you do not necessarily have the nasal congestion that you do with a cold. The flu gives you body aches, fever, dry cough, sometimes gastrointestinal symptoms