See a doctor right away if you have...
Trouble breathing, chest pain or pressure, dizziness, trouble thinking, vomiting that doesn't stop or flu that starts to get better but then you have fever comes back and cough gets worse.
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Aspirin
Alert!
Don't use aspirin or any medicine with aspirin if you have the flu and are less than 18. A child or young person who uses aspirin when they have the flu could get a serious illness called Reye's syndrome.