Flu: MedlinePlus Medical Encyclopedia Flu The flu is an infection of the nose, throat, and lungs. It spreads easily. This article discusses influenza types A and B. Another type of the flu is the swine flu (H1N1). The flu is caused by an influenza virus. Most people get the flu when they breathe in tiny airborne droplets from the coughs or sneezes of someone who has the flu. You can also catch the flu if you touch something with the virus on it, and then touch your mouth, nose, or eyes. People often confuse colds and flu. They are different, ...

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