Basics
What are norovirus symptoms?
90-Second Answer
Last updated June 28, 2026
Short answer
Common norovirus symptoms include diarrhea, vomiting, nausea, and stomach pain. Some people also have fever, headache, or body aches.
What it means
CDC says symptoms usually develop 12 to 48 hours after exposure. Most people get better in one to three days, but dehydration can become a concern.
What to know
Symptoms alone do not prove norovirus. Other infections and food-related illnesses can look similar, so official guidance and medical advice matter when symptoms are severe or unusual.
When to check official guidance
Contact a healthcare professional for severe symptoms, signs of dehydration, bloody stool, high fever, or illness in infants, older adults, or people with weakened immune systems.
Sources
Hantavirus Now summarizes external public health information in plain language. Source links open in a new tab.