Do H1N1 symptoms always include fever?

Answers from James M. Steckelberg, M.D.

While most people infected with H1N1 flu (swine flu) develop a fever greater than 100 F (37.8 C), some people don't experience fever with H1N1 infection.

H1N1 symptoms commonly include:

  • Fever
  • Coughing
  • Sore throat
  • Runny or stuffy nose
  • Headaches or body aches
  • Chills
  • Fatigue

H1N1 symptoms may also include vomiting or diarrhea in some cases.

Diagnosing H1N1 flu may be a little trickier in people who don't develop a fever. And it may be more difficult for these people to know when it's safe to go back to work or school. CDC guidelines currently recommend staying home for at least 24 hours after your fever subsides — without the use of fever-reducing medicines.

Nov. 06, 2009