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Flu symptoms usually come on quickly. They can make you feel very sick.

They include:¹

• Fever (about 100 degrees to 104 degrees)
• A dry cough
• Muscle aches
• Headache
• A stopped up nose
• Sore throat
• Feeling extremely tired.

Children might also get nauseous and have diarrhea and vomiting.

Young children and older people may not have all of these symptoms. But they're more likely to become very sick.²

Your doctor will probably decide whether you have the flu based on your symptoms. Your doctor can find out for certain if you have the flu by testing a sample of fluid from your nose or your blood. But most people won't need these tests.³

Most people don't need to see a doctor if they have the flu. The best thing to do is to stay at home, rest and drink plenty of fluids. Acetaminophen (Tylenol) can help with aches or fever.

However, you should see a doctor if you:

• Are elderly
• Are pregnant
• Have a medical condition (such as heart failure or asthma)
• Have a young child who has the flu
• Have symptoms lasting more than a few days.

This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment. ©BMJ Publishing Group Limited 2008. All rights reserved.