Often called the flu, influenza is a respiratory infection that causes mild to severe illness. In serious cases, it can lead to death. It is a viral disease that can resemble but is not the same as a cold. The onset of this illness is often sudden and it can be quite debilitating.
Most people who contract the flu get well within less than two weeks. Some develop more moderate to serious complications. Anyone can get it, even healthy people. According to the Centers for Disease Control and Prevention (CDC) , seniors, children, and people with chronic illnesses are the most vulnerable groups.
The flu and cold share many symptoms. The difference is often in intensity and frequency. This article discusses some signs that can help you know when you have the flu.