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The Symptoms of Norovirus

Do you think you have the stomach flu or a stomach bug?

Woman bent over holding stomach

It’s probably norovirus, a common virus that is not related to the flu. Norovirus is the most common cause of foodborne diarrhea and vomiting.

The most common symptoms of norovirus are:

  • diarrhea
  • vomiting
  • nausea
  • stomach pain

Other symptoms include:

  • fever
  • headache
  • body aches

Norovirus causes inflammation of the stomach or intestines. This is called acute gastroenteritis.

A person usually develops symptoms 12 to 48 hours after being exposed to norovirus. Most people with norovirus illness get better within 1 to 3 days.

If you have norovirus illness, you can feel extremely ill, and vomit or have diarrhea many times a day. This can lead to dehydration, especially in young children, older adults, and people with other illnesses.

Symptoms of dehydration include:
  • decrease in urination
  • dry mouth and throat
  • feeling dizzy when standing up

Children who are dehydrated may cry with few or no tears and be unusually sleepy or fussy.

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