Most vomiting and diarrhea from stomach bugs or food poisoning resolves on its own within one to three days. The most important thing you can do right now is replace lost fluids, rest your stomach briefly, and ease back into eating. Here’s how to manage each phase.
Start Replacing Fluids Immediately
Dehydration is the real danger when you’re losing fluids from both ends. Your body loses water, salt, and potassium with every episode, and replacing plain water alone isn’t enough because it lacks the electrolytes your cells need to actually absorb the fluid.
The most effective rehydration method uses a combination of salt, sugar, and water. The sugar activates a transport system in your gut that pulls sodium and water into your bloodstream even while you’re still sick. Oral rehydration solutions sold at pharmacies are formulated for this purpose. If you can’t get to a store, the WHO’s formula calls for about half a teaspoon of salt and six level teaspoons of sugar dissolved in one liter of clean water. It won’t taste great, but it works.
The key mistake people make is drinking too much too fast. If you’re vomiting, take small sips every few minutes rather than gulping a full glass. A tablespoon every five minutes is a good starting point. As your stomach settles, gradually increase the amount. For young children, a teaspoon at a time works better. Popsicles, clear broth, and diluted juice are also options once you can keep small sips down.
Let Your Stomach Rest, Then Eat
You don’t need to force food while you’re actively vomiting. But you also shouldn’t starve yourself for days. Once you’ve gone about eight hours without vomiting, try small amounts of bland, soft food.
You may have heard of the BRAT diet (bananas, rice, applesauce, toast). It’s a useful starting point, but the American Academy of Pediatrics and Cleveland Clinic no longer recommend following it strictly for more than a day because it lacks protein, calcium, vitamin B12, and fiber. Sticking with it too long can actually slow recovery by depriving your body of the nutrients it needs to heal. Think of BRAT foods as a launching pad: start there, then add other gentle foods like plain crackers, boiled potatoes, cooked carrots, chicken soup, or scrambled eggs as soon as you can tolerate them. The general guidance is to eat as tolerated and return to a normal diet as quickly as your stomach allows.
While you’re recovering, avoid dairy (except yogurt, which is usually fine), fried or greasy foods, caffeine, alcohol, and heavily spiced meals. These can irritate your gut and trigger another round of symptoms.
What Helps Stop the Nausea
Ginger has solid clinical evidence behind it for reducing vomiting. Studies show that around 1 gram per day (roughly half a teaspoon of ground ginger) taken for three or more days reduced acute vomiting by about 60%. You can get this from ginger tea, ginger chews, or capsules. Steep a thumb-sized piece of fresh ginger in hot water for five minutes, or dissolve ginger powder in warm water and sip slowly.
Other practical measures that help: lie on your side rather than your back to avoid aspiration if you vomit in your sleep. Avoid strong smells. Open a window or turn on a fan. Breathe slowly and deliberately through your nose when a wave of nausea hits. Cold compresses on the back of your neck can also take the edge off.
Over-the-Counter Medications
Anti-diarrheal medications containing loperamide (the active ingredient in Imodium) can slow things down by reducing gut contractions. This gives your intestines more time to absorb water, which firms up your stool. However, there are situations where you should not use it:
- Bloody stool combined with fever: these can be signs of a bacterial infection where slowing your gut actually traps the pathogen inside longer.
- Diarrhea that started after a course of antibiotics: this could indicate a specific bacterial overgrowth that needs medical treatment, not suppression.
- Inflammatory bowel disease flare-ups: loperamide can worsen these episodes.
Bismuth subsalicylate (the active ingredient in Pepto-Bismol) can help with both nausea and diarrhea. It coats the stomach lining and has mild antimicrobial properties. It’s generally safe for adults but may turn your tongue and stool black temporarily, which is harmless.
For vomiting specifically, antiemetic medications are available over the counter in some countries or by prescription in others. If you can’t keep any fluids down for more than 12 hours, this is worth pursuing.
Probiotics Can Shorten Recovery
Certain probiotic strains help your gut fight off the infection faster. The best-studied strain for acute diarrhea is Saccharomyces boulardii, a beneficial yeast. In clinical trials, it shortened the time to rehydration by about nine hours and helped normalize stool consistency roughly 15 hours faster than placebo. You can find it at most pharmacies, often sold under brand names like Florastor. Starting it early in your illness gives the best results.
Lactobacillus rhamnosus GG is another well-researched option, particularly for children. Look for products that list the specific strain on the label rather than generic “probiotic blend” supplements.
How Long This Usually Lasts
The timeline depends on the cause. Norovirus, the most common culprit behind stomach bugs, typically resolves within one to three days. Food poisoning from bacterial toxins (the kind you get from a bad restaurant meal) often passes even faster, sometimes within 12 to 24 hours, because your body is reacting to a toxin rather than fighting an active infection. Bacterial infections like salmonella or campylobacter can take four to seven days.
Keep in mind that even after you feel better, you can still spread norovirus for several days. Wash your hands thoroughly and avoid preparing food for others during this window.
Signs You’re Getting Dehydrated
Watch for these specific warning signs that your fluid loss is outpacing what you’re taking in:
- Urinating much less than usual: dark yellow or amber urine, or going many hours without needing to urinate at all. In infants, no wet diaper for three hours is a red flag.
- Skin that stays tented: pinch the skin on the back of your hand. If it doesn’t flatten back immediately, you’re significantly dehydrated.
- Dizziness when standing up: this means your blood volume has dropped enough to affect circulation.
- Dry mouth and no tears: especially important to watch for in young children and older adults, who dehydrate faster.
Severe dehydration, blood in your vomit or stool, a fever above 102°F (39°C), symptoms lasting beyond three days, or an inability to keep any fluids down for more than 12 hours all warrant medical attention. Young children, older adults, pregnant women, and people with weakened immune systems have a lower threshold for complications and should be monitored more closely from the start.