What is influenza?

Influenza (also known as the flu) and influenza H1N1 are both influenza viruses that can cause mild to severe illness. Influenza usually comes on suddenly and typically includes fever and cough or sore throat. Other symptoms may include headache, extreme tiredness, runny or stuffy nose, or muscle aches. Nausea, vomiting, and diarrhea are other flu symptoms and are typically more common in children than adults.

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1. Who is at increased risk for flu complications?
2. What is influenza?
3. Does everyone with the flu need to see a health care provider or get tested and treated?
4. I think I have the flu. Can I get tested and treatment for H1N1 influenza or seasonal flu?
5. Who needs to call or visit a health care provider?
6. When should I see a medical provider or go to an emergency room right away?