For a basic upset stomach, over-the-counter options like bismuth subsalicylate (Pepto-Bismol), antacids, or simethicone for gas will handle most cases within 30 minutes to a few hours. The right choice depends on what’s actually going on: nausea, bloating, diarrhea, and acid-related pain each respond to different remedies. Here’s how to match what you’re feeling to what actually works.
For Nausea and General Queasiness
Bismuth subsalicylate is the go-to for that vague, unsettled feeling. It coats the stomach lining, reduces inflammation, and has mild antimicrobial effects that help when a bug is responsible. It also works for nausea that comes with diarrhea or mild cramping, making it a good all-purpose choice when you’re not sure exactly what’s wrong.
Ginger is a well-supported natural option. Fresh ginger tea, ginger chews, or ginger capsules can ease nausea effectively. If your stomach feels sour or acidic on top of the nausea, a basic antacid containing calcium carbonate (like Tums) neutralizes stomach acid quickly and can settle things down within minutes.
For Gas and Bloating
Simethicone (sold as Gas-X or Mylicon) works by merging small gas bubbles in your gut into larger ones that are easier to pass. It typically starts working within 30 minutes. It doesn’t get absorbed into your bloodstream, so side effects are essentially nonexistent. If your upset stomach feels more like uncomfortable pressure or fullness with bloating, this is the right pick over an antacid or bismuth product.
Peppermint oil capsules are another option for bloating and cramping. Peppermint relaxes the smooth muscle in your digestive tract by blocking calcium channels in the gut wall, which reduces spasms. One important caveat: if you have acid reflux or a hiatal hernia, peppermint can make things worse. It relaxes the valve between your stomach and esophagus, letting acid travel upward.
For Diarrhea
Two over-the-counter options stand out. Loperamide (Imodium) slows the movement of your intestines, giving your body more time to absorb water and firming up your stools. Bismuth subsalicylate also reduces the frequency of loose, watery stools and eases cramping. Both are effective, but there’s one hard rule: skip them entirely if you have a fever or notice blood in your stool. Those signs suggest an infection your body needs to clear, and slowing down your gut can make it harder to do that.
Staying hydrated matters more than any medication when diarrhea is involved. You lose water, sodium, and potassium rapidly. Sipping an oral rehydration solution, broth, or even diluted juice replaces what you’re losing faster than plain water alone.
What to Eat (and What to Skip)
The classic BRAT diet (bananas, rice, applesauce, toast) has been recommended for decades, though no studies have actually compared it against other approaches. That said, the individual foods have real benefits. Bananas and applesauce contain pectin, a soluble fiber that binds excess water and helps firm up stools. Bananas also replenish potassium, which gets depleted during diarrhea. Plain white rice is starch-heavy, and that starch converts into soluble fiber in your gut. All four foods are bland enough that they’re unlikely to trigger more nausea or vomiting.
You don’t need to limit yourself strictly to those four foods, though. After a day or two, start adding more nutritious options: cooked carrots, butternut squash, sweet potatoes without skin, avocado, skinless chicken, turkey, fish, and eggs. These are still easy to digest but provide the protein and nutrients your body needs to actually recover, not just survive.
While your stomach is unsettled, avoid caffeine, alcohol, fatty or fried foods, dairy, and anything spicy. These all either stimulate acid production, speed up your gut, or are simply harder to break down.
Probiotics for Recurring Stomach Issues
Probiotics won’t fix an upset stomach in the next hour, but specific strains have solid evidence behind them for reducing abdominal pain and digestive symptoms over time. A large meta-analysis published in The Lancet found that certain strains significantly reduced abdominal pain, with some showing four to five times the benefit of placebo. The yeast-based probiotic Saccharomyces boulardii has the most evidence for acute digestive distress and is commonly recommended during and after antibiotic use to prevent gut disruption.
Not all probiotic products are equal. The benefits are strain-specific, meaning a generic “probiotic blend” may not contain the strains that have actually been tested. Look for products that list specific strain names and numbers on the label.
Safety Concerns Worth Knowing
Bismuth subsalicylate carries a specific risk for children and teenagers. Because it contains a salicylate (chemically related to aspirin), it should not be given to kids who have or are recovering from chicken pox or flu-like symptoms. The FDA requires a warning label on these products due to a potential link to Reye’s syndrome, a rare but serious condition affecting the brain and liver. For children with stomach issues, stick to clear fluids, bland foods, and age-appropriate options your pharmacist can recommend.
Antacids are safe for occasional use but can interfere with the absorption of other medications. If you take prescription drugs, space them at least two hours apart from antacid doses. Loperamide should only be used for a day or two at standard doses. Taking more than directed is dangerous and can cause serious heart problems.
Signs That Need Medical Attention
Most upset stomachs resolve on their own within a day or two. But certain patterns signal something more serious. Get evaluated if your pain is severe enough to interrupt normal functioning, if you can’t keep any liquids down, or if you notice blood in your vomit or stool.
Pain that starts near your belly button and migrates to your lower right side, especially if it worsens when you move, cough, or take deep breaths, is a classic pattern for appendicitis. Other warning signs include a fever above 101°F alongside stomach pain, abdominal swelling, inability to pass gas combined with severe pain, or symptoms that resemble a previous episode but feel distinctly worse this time. Upper abdominal pain that starts mild and intensifies after eating, particularly with nausea and a rapid pulse, can indicate pancreatitis. None of these will respond to Tums or ginger tea, and delaying care can lead to complications.