A person will usually develop symptoms such as vomiting, stomach pain, and diarrhea within 12-48 hours of consuming contaminated food or drink. Coming into contact with bodily fluids of patients who carry the virus can also lead to infection. Symptoms usually last for about 24-72 hours from their onset.
Common symptoms include:
- Nausea, vomiting
- Watery or loose diarrhea
- Stomach pain
- Body and muscle aches
Although the nausea and vomiting experienced can be quite severe, physical examinations usually do not show any localized pain or abdominal cramps in a specific, precise area, making it difficult to separate diagnosis of norovirus infection from other diseases with similar symptoms and signs, such as intussusception, appendicitis, or other diseases and infections caused by food poisoning.
For patients who vomit or have diarrhea frequently throughout the day, this can lead to symptoms of severe dehydration, such as fever, extreme weakness, weak but rapid pulse, and low blood pressure.