Most stomach viruses clear up within one to three days. Norovirus, the most common cause, follows a predictable pattern: symptoms hit hard and fast, peak within the first 24 hours, then taper off. Some people feel fully recovered in a day, while others deal with lingering fatigue and loose stools for up to a week.
The Full Timeline From Exposure to Recovery
A stomach virus doesn’t announce itself right away. After you’re exposed, there’s a quiet window of 12 to 48 hours before anything happens. During this incubation period, the virus is multiplying in your gut, but you feel fine. Then symptoms arrive suddenly, often overnight or within a few hours: nausea, vomiting, watery diarrhea, stomach cramps, and sometimes a low fever or body aches.
The worst of it typically lasts 24 to 48 hours. Vomiting usually stops first, often within 12 to 24 hours. Diarrhea tends to hang on a day or two longer. By day three, most adults are past the acute phase and starting to feel like themselves again. Children and older adults can take slightly longer to bounce back because they’re more vulnerable to dehydration, which slows overall recovery.
You’re Still Contagious After You Feel Better
This is the part most people don’t realize. Even after your symptoms are completely gone, you can still spread norovirus for two weeks or more. The virus continues shedding in your stool long after you feel fine, which is why stomach bugs tear through households, schools, and workplaces so effectively.
The most contagious window is while you’re actively sick and during the first few days after symptoms stop. Thorough handwashing with soap and water is your best defense during this period. Alcohol-based hand sanitizers are not as effective against norovirus as they are against many other germs, so soap and running water is the priority.
Cleaning Surfaces the Right Way
Norovirus is tough. It survives on countertops, doorknobs, and bathroom surfaces for days, and regular household cleaners don’t reliably kill it. You need a bleach solution: 5 to 25 tablespoons of standard household bleach (5% to 8% concentration) per gallon of water. Spray or wipe it on the surface and leave it for at least five minutes before wiping it off. If you prefer not to mix your own, look for a disinfectant that’s EPA-registered specifically against norovirus.
Pay special attention to bathrooms, light switches, faucet handles, and any surface the sick person touched. Wash contaminated laundry (sheets, towels, clothing) on the hottest setting and dry on high heat.
What to Eat and Drink While Recovering
Dehydration is the real danger with a stomach virus, not the virus itself. You’re losing fluids rapidly through vomiting and diarrhea, so replacing them is the single most important thing you can do. Take small, frequent sips of water, broth, or an oral rehydration solution. Avoid gulping large amounts at once, which can trigger more vomiting.
There’s no need to follow a strict reintroduction diet. Once your appetite returns, you can go back to eating your normal foods, even if you still have some diarrhea. You don’t have to stick to bland foods like toast and bananas, though many people find those easier to tolerate at first. The key is to eat when you feel ready and not force it before that. For children, the same principle applies: offer their usual foods as soon as they’re interested in eating. Infants should continue breastfeeding or formula feeding throughout the illness.
Signs That Something More Serious Is Happening
Most stomach viruses are miserable but harmless. A few red flags, though, mean you need medical attention:
- You can’t keep liquids down for 24 hours. This puts you at serious risk of dehydration.
- Vomiting or diarrhea lasting more than two days without improvement.
- Blood in your vomit or stool.
- Signs of dehydration: very dark urine, little or no urine output, dizziness, dry mouth, or severe weakness.
- Fever above 104°F (40°C).
- Severe stomach pain that goes beyond typical cramping.
For young children, the thresholds are lower. A fever above 102°F (38.9°C), bloody diarrhea, unusual irritability, or crying without tears all warrant a call to their doctor. For babies, a dry mouth, no wet diaper in six hours, or a sunken soft spot on the head are urgent signs of dehydration.
Lingering Gut Issues After Recovery
For most people, a stomach virus is a short, unpleasant experience with no lasting effects. But a meaningful minority develop ongoing digestive symptoms afterward. Research pooling data from multiple studies found that about 10% of people who had infectious gastroenteritis still met the criteria for irritable bowel syndrome a full year later. That number actually rose slightly, to around 14.5%, when researchers checked beyond the 12-month mark.
These post-infection symptoms can include bloating, cramping, irregular bowel habits, and increased sensitivity to certain foods. They don’t mean the virus is still active. Instead, the infection appears to disrupt normal gut function in some people, particularly those who had a more severe initial illness. If your digestion still feels off weeks after a stomach bug, it’s worth bringing up with your doctor, because targeted dietary changes and other approaches can help.