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Influenza

, commonly known as the flu, is an disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and . These symptoms begin one to four days after exposure to the virus and last for about two to eight days. and vomiting can occur, particularly in children. Influenza may progress to from the virus or a subsequent . Other include acute distress , , , and worsening of pre-existing health problems such as and disease.

Underlined words are explained — tap any of them.

Symptoms — what it feels like

  • ·Fever, runny nose, sore throat, muscle pain, headache, coughing,

Causes — why it happens

  • · A, B, and C viruses

Prevention

  • ·Hand washing, flu vaccines

Test yourself

0/4 answered

4 quick questions on Influenza. Tap an answer to check it.

1. What causes influenza (the flu)?
2. How soon do flu symptoms usually begin after being exposed to the virus?
3. Which is a common symptom of influenza?
4. Which serious lung problem can influenza sometimes lead to?
Plain-language summary adapted from Wikipedia. Not medical advice.