Most stomach viruses last 1 to 3 days, though symptoms can stretch to 8 days depending on the virus and your overall health. The two most common culprits, norovirus and rotavirus, follow slightly different timelines, but the worst of it typically passes within 72 hours for otherwise healthy adults.
Timeline by Virus Type
Norovirus is the most common cause of stomach bugs in adults, responsible for 19 to 21 million illnesses in the United States each year. Symptoms usually hit fast, appearing 12 to 48 hours after exposure. The intense vomiting and diarrhea phase generally lasts 1 to 3 days before tapering off.
Rotavirus tends to affect young children more severely and runs a longer course. Vomiting and watery diarrhea from rotavirus can last 3 to 8 days. Children under five are especially likely to land on the longer end of that range. Adults who catch rotavirus often have milder symptoms that resolve more quickly, partly because most adults have some degree of prior exposure.
What the Illness Actually Feels Like, Day by Day
The first 12 to 24 hours are usually the roughest. Vomiting tends to come in waves, sometimes every 20 to 30 minutes, and you may not be able to keep anything down. Diarrhea often starts a few hours after the vomiting begins or overlaps with it. Fatigue, body aches, low-grade fever, and cramping are all common during this initial phase.
By day two, vomiting usually slows or stops entirely. Diarrhea often lingers a bit longer, sometimes continuing for another day or two after the vomiting ends. You’ll likely feel washed out and low on energy even as the active symptoms ease. By day three or four, most people are through the worst of it but may not feel fully back to normal for another few days. Appetite returns gradually, and mild nausea or a sensitive stomach can hang around for up to a week.
How Long You Stay Contagious
This is where the timeline matters for people around you. With norovirus, you’re most contagious while actively symptomatic and for at least two to three days after symptoms stop. Some people continue shedding the virus in their stool for two weeks or longer, even after feeling completely fine. That’s why handwashing remains critical well after recovery.
Norovirus is remarkably tough outside the body too. It can survive on hard surfaces like countertops and doorknobs for up to 21 to 28 days at room temperature. Standard cleaning products like alcohol-based wipes and quaternary ammonium sprays don’t reliably kill it. Bleach-based cleaners are the most effective option: a solution of about 1,000 to 5,000 parts per million of sodium hypochlorite (roughly 5 to 25 tablespoons of regular household bleach per gallon of water) with at least a one-minute contact time is what it takes to eliminate the virus from surfaces.
Staying Hydrated During Recovery
Dehydration is the main medical risk from a stomach virus, not the virus itself. When you’re losing fluids from both ends, replacing water alone isn’t enough. You also need electrolytes, specifically sodium and potassium. Oral rehydration solutions (sold over the counter as Pedialyte for children or similar products for adults) are the most effective option. Sports drinks are a second choice since they contain more sugar and less sodium than ideal.
If you’re vomiting too frequently to keep fluids down, take small sips every few minutes rather than large gulps. Even a tablespoon every five minutes adds up. For children under 22 pounds, aim for about 2 to 4 ounces of oral rehydration solution after each episode of vomiting or diarrhea. For larger children and adults, 4 to 8 ounces per episode is a reasonable target.
Watch for signs that dehydration is becoming serious: no urination for 8 or more hours, very dark urine, dizziness when standing, dry mouth with no tears when crying (in children), or a sunken appearance around the eyes. Infants, older adults, and people with chronic illnesses are most vulnerable.
What to Eat as You Recover
The old advice to stick strictly to bananas, rice, applesauce, and toast (the BRAT diet) is outdated. While those foods are gentle on your stomach, the American Academy of Pediatrics no longer recommends a strict BRAT diet for children because it’s too low in the nutrients your gut needs to heal. Following it for more than 24 hours can actually slow recovery.
A better approach: eat bland, soft foods as you tolerate them, and expand your diet as soon as you’re able. Plain crackers, broth, boiled potatoes, plain pasta, eggs, and lean chicken are all reasonable choices early on. Avoid greasy, spicy, or heavily sweetened foods for the first day or two, as they’re more likely to trigger nausea. The key is getting calories and nutrients back in as your stomach allows, rather than restricting yourself unnecessarily. Your body needs fuel to recover.
When Symptoms Linger Beyond a Week
If your diarrhea, bloating, or cramping continues well past the expected 3 to 8 day window, you may be dealing with something beyond the original infection. A small but significant percentage of people develop a condition called post-infectious irritable bowel syndrome (PI-IBS) after a stomach virus. This involves ongoing abdominal pain, changes in bowel habits, and digestive sensitivity that can persist for months or even years after the original infection has cleared.
PI-IBS is typically diagnosed when abdominal pain occurs at least one day per week for three months, along with changes in stool frequency or appearance. About half of PI-IBS cases eventually resolve on their own, but the timeline is long: six to eight years for that 50% mark. This doesn’t mean every lingering symptom is PI-IBS. A few extra days of loose stools or mild bloating after a stomach virus is normal as your gut bacteria rebalance. But if digestive issues are still disrupting your life weeks later, it’s worth looking into.
Can You Catch the Same Virus Again?
Unfortunately, yes. Norovirus has dozens of strains, and immunity to one strain doesn’t protect you from the others. Even immunity to the same strain fades relatively quickly, so reinfection within the same season is possible, though it tends to be milder the second time around. This is why norovirus outbreaks sweep through households, schools, and cruise ships so efficiently. There is no lasting vaccine-like protection from having been sick, which makes hand hygiene and surface disinfection the most reliable defenses.