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    https://www.mayoclinic.org › diseases-conditions › flu › symptoms-causes

    Influenza (flu) - Symptoms and causes - Mayo Clinic

    • Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from the "stomach flu" viruses that caus… See more

    Symptoms

    The viruses that cause flu spread at high levels during certain times of the year in the Northern and Southern hemispheres. These are called flu seasons. In North America, fl… See more

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    Causes

    Influenza is caused by viruses. These viruses travel through the air in droplets when someone … See more

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    Risk Factors

    There are a range of factors that may raise your risk of catching a flu virus or having complications from a flu infection. See more

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    Complications

    If you're young and healthy, the flu usually isn't serious. Although you may feel awful while you have it, the flu usually goes away in a week or two with no lasting effects. But people at hi… See more

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    Flu (Influenza): Causes, Symptoms, Types & Treatment
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