If a sore throat lasts for weeks, it could be mono. Symptoms of mono include sore throat, extreme fatigue, swollen glands, fever, chills, and headache, and lingering symptoms can last for months.
There is no vaccine against the virus that causes mononucleosis and no cure. Most people recover by resting at home, taking over-the-counter pain medication, and eating a healthy diet with plenty of fluids.

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