Quick Scoop

The stomach bug most often “going around” in 2023 was **norovirus** — the highly contagious virus commonly called the **stomach flu** , though it is not influenza. It surged in the U.S. in **March 2023** and stayed active into late spring, with outbreaks also rising on cruise ships.

What people usually mean

When people ask about a “stomach bug,” they’re usually referring to viral gastroenteritis , and norovirus is the main culprit behind many of those outbreaks. It causes sudden vomiting, diarrhea, stomach cramps, and nausea.

Why it stood out in 2023

Reports from that period said norovirus activity in 2023 was higher and earlier than usual , with March 2023 reaching the highest levels seen in over a decade in the U.K. and a strong surge in U.S. outbreaks as well. Experts also pointed to more exposure after pandemic-era disruptions as one reason for the rise.

Common signs

• Sudden vomiting.
• Diarrhea.
• Stomach pain or cramps.
• Nausea, sometimes with fever or body aches.

When to be cautious

Most cases improve with rest and fluids, but dehydration can become a concern, especially in young children, older adults, or anyone unable to keep liquids down.

If you want, I can also give you a short “is it norovirus or food poisoning?” guide.