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    Cold, Flu, & Cough Health Center

    Understanding Flu Symptoms

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    It can be hard to figure out when you have the flu and not just a cold. Look for these symptoms:

    When to Call Your Doctor

    • You have these symptoms, and you also have a weakened immune system because of cancer, diabetes, AIDS, or other conditions.
    • Your fever lasts more than 3 or 4 days, you get short of breath while resting, and you have chest pain. You may have pneumonia.
    • Your nasal drainage is yellow or green and has lasted for more than 10 days. You could have a sinus infection.

    WebMD Medical Reference

    Reviewed by Jennifer Robinson, MD on October 24, 2014

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