Most cases of adult diarrhea clear up on their own within one to three days. The most important thing you can do during that time is replace lost fluids and electrolytes, eat the right foods, and avoid the ones that make things worse. Over-the-counter medications can also help control symptoms while your body recovers.
Fluids and Electrolytes Come First
Diarrhea pulls water and minerals out of your body fast. Dehydration is the main risk, not the diarrhea itself. Signs you’re getting dehydrated include excessive thirst, dry mouth, dark urine, dizziness, and weakness.
Focus on drinks that replace both water and electrolytes. Broths, soups, and sports drinks are good choices because they contain sodium and potassium, the two minerals you lose most. Sip steadily throughout the day rather than drinking large amounts at once, which can trigger another trip to the bathroom. Plain water is fine too, but pairing it with salty foods like crackers or pretzels helps your body hold onto the fluid.
What to Eat During Recovery
You don’t need to stop eating. In fact, continuing to eat helps your intestines recover faster. The goal is bland, easy-to-digest food that won’t irritate your gut further.
Good choices include white rice, plain toast, bananas, boiled potatoes (with the skin, which is rich in potassium), applesauce, and simple crackers. Fruit juices and nectars can help restore potassium, though you may want to dilute them if the sugar content bothers your stomach. Keeping some salt in your diet through soups and broth is equally important for rehydration.
Eat smaller meals spread throughout the day instead of three large ones. This puts less strain on your digestive system while keeping calories and nutrients coming in.
Foods and Drinks That Make It Worse
Some foods actively pull water into your intestines or speed up gut contractions, which is the opposite of what you need. Avoid these until symptoms resolve:
- Greasy and fried foods. High-fat meals are harder to digest and can worsen loose stools.
- Dairy products. About 70% of adults worldwide don’t produce enough of the enzyme that breaks down lactose. Undigested lactose ferments in the colon and causes gas, bloating, and more diarrhea. Limit milk and milk products to two cups a day or less.
- Caffeine. Coffee, tea, cola, and chocolate all stimulate the gut and can increase the frequency of loose stools.
- Sugar alcohols. Sorbitol, mannitol, and xylitol, found in sugar-free gum, candies, and many “diet” desserts, are well-documented causes of diarrhea. Check labels carefully.
- High-fructose foods. Processed sweets, soft drinks with high-fructose corn syrup, and even naturally high-fructose fruits like apples, pears, and dried fruit can aggravate symptoms in the same way undigested lactose does.
- Carbonated drinks. The fizz creates gas in your digestive tract, adding bloating and discomfort on top of diarrhea.
- Spicy foods and very sweet foods. Both can irritate an already inflamed gut lining.
Over-the-Counter Medications
Loperamide (sold as Imodium) is the most widely used anti-diarrheal. It works by slowing down intestinal contractions, giving your gut more time to absorb water from stool. The standard dose for adults is 4 mg (two caplets) after the first loose bowel movement, then 2 mg (one caplet) after each subsequent loose stool. Don’t exceed 8 mg in 24 hours with the over-the-counter version.
Bismuth subsalicylate (Pepto-Bismol) is another option. It coats the lining of your stomach and intestines, reducing inflammation and slowing fluid secretion. It can turn your tongue and stools black temporarily, which is harmless. Avoid it if you’re allergic to aspirin, since it contains a related compound.
These medications are meant for short-term symptom relief. They’re helpful when you need to get through a workday or a flight, but they don’t treat the underlying cause.
Ginger and Other Home Remedies
Ginger has natural properties that reduce muscle spasms in the gut, which can ease cramping and slow the urge to go. A simple way to use it is steeping one to two tablespoons of grated or chopped fresh ginger in boiling water for several minutes and drinking it as tea. Chamomile tea may also help soothe digestive discomfort, though the evidence is less specific.
Probiotics, found in yogurt or available as supplements, can help restore the balance of gut bacteria, particularly after a bout of viral or antibiotic-related diarrhea. Look for products containing Lactobacillus or Saccharomyces strains, which have the most evidence behind them for diarrhea recovery.
How Long Diarrhea Typically Lasts
Viral diarrhea, the most common type in adults, usually resolves within one to three days. Norovirus and similar stomach bugs run their course quickly as long as you stay hydrated. If your symptoms haven’t improved after two days, that’s a signal something else may be going on: a bacterial infection, a medication side effect, or a food intolerance.
Diarrhea lasting more than four weeks is considered chronic and points to conditions like irritable bowel syndrome, inflammatory bowel disease, or celiac disease, all of which need a proper diagnosis.
Warning Signs That Need Medical Attention
Most diarrhea is uncomfortable but not dangerous. However, certain symptoms indicate you should get medical help promptly:
- No improvement after two days
- Fever above 102°F (39°C)
- Blood or black color in your stool
- Severe abdominal or rectal pain
- Signs of dehydration: very dark urine, little or no urination, extreme thirst, dizziness, or severe weakness
Bloody stools and high fever can signal a bacterial infection that may need targeted treatment rather than just time and fluids.