Most cases of diarrhea resolve on their own within one to two days with the right combination of fluid replacement, simple dietary changes, and, when needed, over-the-counter medication. The key priorities are preventing dehydration, choosing foods that are easy on your gut, and knowing which symptoms signal something more serious.
Replace Fluids First
Dehydration is the biggest immediate risk with diarrhea, not the diarrhea itself. Every loose stool pulls water and electrolytes out of your body, and if you’re also vomiting, the losses add up fast. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. Better options include oral rehydration solutions (available at any pharmacy), clear broths, coconut water, or diluted fruit juice. Sip steadily rather than gulping large amounts at once, which can trigger nausea.
Signs you’re getting dehydrated include dark yellow urine, dry mouth, dizziness when standing, and feeling unusually tired. In children, watch for crying without tears, a sunken appearance around the eyes or belly, and unusual drowsiness or irritability.
What to Eat (and What to Skip)
The classic BRAT diet (bananas, rice, applesauce, toast) is a fine starting point for the first day or two, but there’s no clinical evidence that restricting yourself to only those four foods speeds recovery. Harvard Health notes that a less restrictive approach makes more sense: brothy soups, oatmeal, boiled potatoes, crackers, and unsweetened dry cereals are equally gentle on your stomach while providing more nutrition.
Once things start to settle, usually within 24 to 48 hours, gradually add foods with more protein and nutrients. Cooked squash, carrots, skinless chicken, fish, eggs, and avocado are all easy to digest and give your body what it needs to recover. The goal is to move back toward a normal diet relatively quickly rather than staying on bland foods for days.
While you’re recovering, avoid dairy products, fatty or fried foods, high-fiber raw vegetables, caffeine, and alcohol. All of these can speed up gut motility or draw extra water into the intestines, making things worse.
Over-the-Counter Medications
Two common OTC options work in different ways. Loperamide (the active ingredient in Imodium) slows the contractions of your intestinal muscles, giving your gut more time to absorb water. It’s effective for acute, non-specific diarrhea at a daily limit of 8 mg, typically taken as 4 mg after the first loose stool and 2 mg after each subsequent one. Bismuth subsalicylate (found in Pepto-Bismol) coats the lining of your stomach and intestines and has mild antibacterial properties. It’s a better choice when nausea and stomach upset accompany the diarrhea.
One important caution: avoid these medications if you have bloody stools or a high fever. Those symptoms can indicate a bacterial infection, and slowing your gut down in that situation can actually make things worse by keeping the bacteria inside longer.
Probiotics That Actually Help
Not all probiotics are equally useful for diarrhea. The strain with the strongest evidence is Lactobacillus rhamnosus GG, which reduced the duration of acute diarrhea by roughly 19 hours in a randomized controlled trial comparing it to standard care. Saccharomyces boulardii, a yeast-based probiotic often recommended for diarrhea, did not show a statistically significant reduction in the same study. Look for products that list specific strain names on the label, not just the genus. You can find Lactobacillus rhamnosus GG in certain yogurt drinks and supplement capsules sold at most pharmacies.
How to Tell What’s Causing It
The type of diarrhea you’re experiencing gives clues about the cause, which matters because treatment differs.
- Viral (stomach flu, norovirus): Comes on suddenly with watery diarrhea, vomiting, nausea, and sometimes a low fever. This is the most common type and usually resolves in one to three days without any specific treatment beyond fluids and rest.
- Bacterial (food poisoning, traveler’s diarrhea): More likely to cause severe abdominal cramps and high fever. Bloody stools or stools containing mucus point toward bacterial infections like Shigella. Some bacterial infections need antibiotics, so these symptoms warrant a call to your doctor.
- Parasitic: Tends to be chronic or come and go over weeks rather than days. If diarrhea persists beyond a week or keeps returning, a parasitic cause is worth investigating through a stool test.
Ginger and Other Home Remedies
Ginger has well-documented effects on nausea and abnormal stomach rhythms. It helps normalize the electrical activity in the stomach that coordinates digestion, which can be disrupted during illness. That said, a systematic review of 109 randomized controlled trials found no significant evidence that ginger reduces symptoms of irritable bowel syndrome specifically, and its direct effect on diarrhea frequency hasn’t been established in strong trials. It’s a reasonable addition to your recovery plan for easing nausea and stomach discomfort, but it’s not a substitute for fluids and dietary changes. Brew fresh ginger slices in hot water for a simple tea, or use ginger chews if the taste is too strong.
Chamomile tea is another popular choice, though clinical evidence for its effectiveness against diarrhea is thin. It’s unlikely to hurt and may help you stay hydrated if you find plain water unappealing.
Diarrhea in Young Children
Children dehydrate faster than adults, so fluid replacement is even more critical. Offer small, frequent sips of an oral rehydration solution rather than water alone. The World Health Organization recommends zinc supplementation alongside rehydration for children with diarrhea: 20 mg per day for 10 to 14 days, or 10 mg per day for infants under six months. Zinc shortens the duration and severity of episodes. These supplements are available over the counter in most countries. Continue breastfeeding or formula feeding throughout the illness.
When Diarrhea Needs Medical Attention
See a doctor if your diarrhea hasn’t improved after two days, if you notice blood or black color in your stools, if you develop severe abdominal or rectal pain, or if you have a fever above 102°F (39°C). Persistent inability to keep fluids down is also a reason to seek care, since IV fluids may be needed to correct dehydration. For children, the threshold is lower: any signs of dehydration, high fever, or bloody stools in a child should prompt a same-day medical visit.