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Symptoms

Español: Síntomas

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

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

The most common symptoms of norovirus are:

  • diarrhea
  • vomiting
  • nausea
  • stomach pain

Other symptoms include:

  • fever
  • headache
  • body aches

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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