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2. Diarrhea

Alongside vomiting, diarrhea is a hallmark symptom of norovirus—and it usually shows up just as quickly. The stool tends to be watery, and the episodes can be frequent and urgent. For adults, it’s exhausting. For kids and older adults, it can become dangerous if dehydration sets in.

This symptom typically lasts for a couple of days, but during that time, the body can lose a lot of fluids fast. Electrolyte drinks, broths, or even ice chips can help if drinking feels difficult. If symptoms worsen or linger longer than expected, it’s worth checking in with a doctor.

A person sits on a toilet holding a roll of toilet paper tightly, symbolizing the urgency and discomfort of diarrhea—a common and rapid-onset symptom of norovirus. Frequent, watery bowel movements can lead to dehydration, especially in vulnerable groups.

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.