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What are the symptoms of the flu?

Diana Meeks
Diana Meeks on behalf of Sigma Nursing
Family Practitioner

The symptoms of influenza (flu) include a high fever, often over 103 for children; cough; chills; and muscle aches. People with influenza may also experience fatigue, low appetite, headaches, and nasal symptoms such as a runny nose or congestion. In children, influenza can produce digestive problems such as nausea, vomiting, and diarrhea.

Symptoms of influenza (flu) can include:

  • fever
  • cough
  • sore throat
  • runny or stuffy nose
  • body aches
  • headache
  • chills
  • fatigue
  • some people may also have vomiting and diarrhea.

People may be infected with the flu, including 2009 H1N1 flu, and have respiratory symptoms without a fever.

Symptoms of the flu include muscle and joint pain, high fever, a deep cough, chills, fatigue and weakness. These symptoms usually send you straight to bed for three to five days or longer. Afterward, cough and tiredness may persist for days or even weeks. Other symptoms include headache, eye pain and sometimes a stuffy nose and sore throat. Some strains of the flu also produce vomiting and diarrhea. Symptoms usually come on suddenly once you've been exposed to the virus.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.