Stomach Bug May 2025. Less common symptoms include fever, headaches, and body aches. Outbreaks of norovirus, which causes vomiting and diarrhea, are on the rise.

The norovirus, aka the stomach flu, is continuing to circulate, causing more cases in the u.s. Cases of the illness — which can cause nausea, stomach pain and diarrhea — are on the rise in the united states, according to data from the centers for disease.