Most stomach bugs last 1 to 3 days. Symptoms typically hit 12 to 48 hours after exposure, peak within the first day, and gradually ease over the next two days. That said, the exact timeline depends on the virus involved, your age, and your overall health.
The Typical Timeline
Norovirus, the most common cause of stomach bugs in adults, follows a fairly predictable pattern. You’ll start feeling symptoms 12 to 48 hours after picking up the virus, usually beginning with sudden nausea followed by vomiting and watery diarrhea. For most people, the worst of it is over within 24 hours, and full recovery comes within 1 to 3 days.
Children, especially babies and toddlers, often get hit by rotavirus instead. Rotavirus tends to drag on longer, with vomiting and watery diarrhea lasting 3 to 8 days. That extended timeline is one reason dehydration is a bigger concern for young kids. In newborns and infants, severe dehydration can develop in just a day or two of diarrhea.
What Recovery Actually Looks Like
Recovery from a stomach bug isn’t a clean switch from sick to healthy. Most people notice that vomiting stops first, usually within the first day. Diarrhea tends to linger a bit longer, sometimes persisting for a few days after you otherwise feel fine. Low energy and a reduced appetite can stick around for several days beyond that, even after the vomiting and diarrhea have stopped completely.
Your gut can remain sensitive for weeks after the acute illness passes. Some people have trouble digesting lactose (the sugar in dairy) for up to a month or more after recovering. If milk, cheese, or ice cream seem to trigger cramps or diarrhea during that window, it’s not a new intolerance. It’s temporary irritation that resolves on its own.
Eating and Drinking During Recovery
The most important thing during a stomach bug is staying hydrated. Small, frequent sips of water or an oral rehydration solution work better than trying to gulp down a full glass at once. Oral rehydration solutions are available over the counter at most pharmacies and grocery stores, and they replace both fluids and electrolytes more effectively than water alone.
When it comes to food, you don’t need to follow a restricted diet. Research shows that limiting yourself to bland foods doesn’t speed up recovery from viral gastroenteritis. Once your appetite returns, you can go back to eating your normal diet, even if you still have some diarrhea. That said, a few categories of food tend to make symptoms worse while you’re still recovering:
- Caffeinated drinks like coffee, tea, and some sodas
- High-fat foods like fried food, pizza, and fast food
- Sugary drinks including fruit juices and sweetened beverages
- Dairy products, which may be harder to digest for weeks afterward
How Long You’re Contagious
This is where the timeline gets tricky. You’re contagious from the moment symptoms start, but you don’t stop being contagious when you feel better. The virus continues to shed in your stool for 2 to 3 days after symptoms end, and in some cases, viral shedding can continue for several weeks after recovery. You’re most contagious during the illness itself and in those first few days afterward.
For that reason, most workplace and school guidelines require you to be free of vomiting and diarrhea for at least 48 hours before returning. Thorough handwashing with soap and water matters more than hand sanitizer here, since norovirus is notoriously resistant to alcohol-based sanitizers.
Dehydration Warning Signs
Dehydration is the main risk from a stomach bug, not the virus itself. In adults, the threshold to watch is 24 hours. If you can’t keep any liquids down for a full day, that’s the point where medical attention becomes important. For babies, the window is much shorter: if your baby hasn’t had a wet diaper in six hours, that warrants a call to the doctor right away.
Other signs of dehydration to watch for include a dry mouth and throat, dizziness when standing up, dark or infrequent urination, and in children, crying with few or no tears or unusual sleepiness and fussiness.
When Gut Symptoms Don’t Fully Resolve
About 1 in 10 people who get a gut infection develop a condition called post-infectious irritable bowel syndrome. This means that even after the virus clears, you continue to experience bloating, cramping, or changes in bowel habits for months afterward. It’s not another infection. It’s your gut’s immune and nervous system remaining hypersensitive after the initial illness. For most people, these symptoms gradually fade on their own, though the timeline varies widely from person to person.