How common is diarrhoea in norovirus infection?

Norovirus irritates the stomach and intestines, so stools can become loose or watery and may happen alongside a sudden urge to use the toilet. Symptoms can begin abruptly and can make it difficult to keep fluids down when vomiting is also present. Diarrhoea has many possible causes, so it does not by itself identify norovirus.

Take frequent small sips of water or an oral rehydration drink, especially after loose stools or vomiting. Rest, eat simple foods when you feel able, and wash hands carefully with soap and water after using the toilet and before preparing food. Avoid preparing food for other people while you are unwell.

Seek urgent medical help for signs of serious dehydration such as confusion, fainting, very little urine, or an inability to keep fluids down. Get medical advice promptly if there is blood in the stool, severe or worsening abdominal pain, or a high fever. Infants, older adults, pregnant people, and people with weakened immunity may need earlier assessment.

Ask whether your symptoms and examination suggest norovirus or another cause of diarrhoea, whether you need a hydration plan, and which warning signs should lead you to seek urgent care.