Read condition-specific symptoms and clinical context for Human noroviruses. Viruses that cause acute gastroenteritis in people.
Human noroviruses cause acute gastroenteritis, with vomiting and diarrhea. This profile covers a clinical group rather than one viral species. Norovirus illness is distinct from influenza, despite the nickname ‘stomach flu’.
Symptoms often start 12–48 hours after exposure. Clinical assessment may be needed to identify the cause.
Possible symptoms: Vomiting; Diarrhea; Nausea; Abdominal pain; Sometimes fever or body aches.
Severe dehydration needs medical care. Possible signs include reduced urination, dry mouth, and dizziness when standing.
Source check: 2026-09-19. Educational content; independent scientific review remains pending.