Stomach Flu 2025 Canada Nz. Thinking it was food poisoning, she went to the emergency room with severe pain and nausea, only to be sent home with a diagnosis of the stomach flu. It affects people of all ages, but it causes severe acute gastroenteritis in children.
The stomach flu (norovirus) is an acute form of gastroenteritis, or inflamed stomach or intestinal lining caused by a virus, bacteria or parasite. The most common symptoms of norovirus are diarrhea, vomiting, stomach pain, and nausea.