An upset stomach usually gets better on its own, but you can take over-the-counter medicines or natural remedies to ease the symptoms. For quick relief, OTC options like bismuth subsalicylate (Pepto-Bismol) or antacids work well for heartburn and indigestion. Natural remedies like ginger tea or peppermint can also calm nausea and gas. The right choice depends on your main symptom — nausea, pain, bloating, or diarrhea.
What Over-the-Counter Medicines Work Best for an Upset Stomach?
OTC medicines target different stomach problems. You need to match the medicine to your symptom.
Antacids like Tums or Rolaids neutralize stomach acid. They work fast for heartburn and acid reflux. The active ingredient is usually calcium carbonate or magnesium hydroxide. These are safe for most people but can cause constipation or diarrhea if used too often.
Bismuth subsalicylate (Pepto-Bismol) is one of the most popular options. It coats the stomach lining and kills some bacteria that cause diarrhea. Research published in the journal Gastroenterology found it reduces traveler’s diarrhea by about 40%. It works for nausea, indigestion, and loose stools. The downside — it can turn your tongue and stool black. This is harmless but alarming if you do not expect it.
Simethicone (Gas-X) does not reduce gas production. It helps gas bubbles combine so you can pass them more easily. Some people report relief from bloating, but strong clinical evidence is limited. The FDA considers it safe with very few side effects.
Loperamide (Imodium) stops diarrhea by slowing down gut movement. It is effective but should not be used if you have a fever or bloody stool. Those signs suggest a bacterial infection that needs to flush out of your system.
| Symptom | Best OTC Option | How It Works |
|---|---|---|
| Heartburn or acid reflux | Antacids (Tums, Rolaids) | Neutralizes stomach acid |
| Nausea or indigestion | Bismuth subsalicylate (Pepto-Bismol) | Coats stomach lining, kills some bacteria |
| Gas and bloating | Simethicone (Gas-X) | Helps gas bubbles combine |
| Diarrhea without fever | Loperamide (Imodium) | Slows gut movement |
What Natural Remedies Actually Help an Upset Stomach?
Natural options are popular, but not all of them have strong science behind them. Some do. Here is what the evidence actually says.
Ginger is one of the best studied natural remedies for nausea. A 2019 review in the journal Nutrients analyzed 12 studies and found ginger reduced nausea severity by about 30% compared to placebo. It works for pregnancy-related nausea, motion sickness, and post-surgery nausea. You can use fresh ginger in tea, chew crystallized ginger, or take ginger capsules. The effective dose is usually 1 to 1.5 grams per day. More than that can cause heartburn or mouth irritation.
Peppermint helps with gas and cramping. The menthol in peppermint relaxes the muscles of the digestive tract. Enteric-coated peppermint oil capsules are the most effective form because they reach the intestines without being broken down by stomach acid. A 2014 meta-analysis in the Journal of Clinical Gastroenterology found peppermint oil significantly reduced symptoms of irritable bowel syndrome, including stomach pain and bloating. Peppermint tea is milder but can still help for mild discomfort.
Chamomile tea has a mild calming effect. Some studies suggest it can reduce intestinal inflammation and muscle spasms. The evidence is not as strong as for ginger or peppermint, but it is safe and many people find it soothing. One study in Molecular Medicine Reports found chamomile extract reduced diarrhea in mice, but human studies are limited.
Fennel seeds are sometimes chewed after meals in many cultures. They contain compounds that relax the digestive tract. A small study in BMC Gastroenterology found fennel oil reduced IBS symptoms, but more research is needed. Some people report relief from bloating and gas.
Probiotics are widely claimed to help digestion, but the evidence is mixed. Some strains like Lactobacillus rhamnosus GG and Saccharomyces boulardii can reduce the duration of diarrhea by about one day, according to research in the Journal of the American Medical Association. They do not work for immediate relief. They are more for prevention or recovery.
What Causes an Upset Stomach in the First Place?
Understanding the cause helps you choose the right remedy. An upset stomach is a general term that covers several distinct problems.
Indigestion happens when stomach acid irritates the lining. It often comes from eating too fast, eating spicy or fatty foods, or stress. The pain is usually in the upper belly and may come with a burning feeling.
Gas and bloating happen when bacteria in the large intestine ferment undigested food. Certain foods like beans, broccoli, and carbonated drinks cause more gas. Swallowing air while eating also contributes.
Nausea is controlled by the brain’s vomiting center. It can be triggered by motion, pregnancy, infections, medications, or anxiety. The stomach itself may not even be the source.
Diarrhea is the body’s way of flushing out irritants. Viruses like norovirus cause most cases. Bacteria from contaminated food or water also cause it. Most cases resolve within 2-3 days without treatment.
Constipation can also feel like an upset stomach. Hard stools stretch the colon and cause cramping. Low fiber intake, dehydration, and certain medications are common causes.
What Should You Avoid When Your Stomach Is Upset?
Some common advice for upset stomachs actually makes things worse. Here is what to skip.
Do not take ibuprofen or aspirin for stomach pain. These NSAIDs can damage the stomach lining and make indigestion worse. They are fine for headaches but not for belly pain. Acetaminophen (Tylenol) is safer but does not help stomach symptoms directly.
Avoid dairy products if you have diarrhea. Many people temporarily lose the ability to digest lactose during a stomach bug. Milk, cheese, and ice cream can make diarrhea worse or last longer.
Skip high-fiber foods during acute diarrhea. Bran, raw vegetables, and whole grains can speed up the gut and worsen loose stools. The BRAT diet — bananas, rice, applesauce, toast — is still recommended for short-term recovery. These foods are low in fiber and easy to digest.
Do not lie down right after eating. Gravity helps keep stomach acid where it belongs. Lying down within 30 minutes of a meal increases the chance of acid reflux. Stay upright or take a gentle walk instead.
Carbonated drinks and alcohol can irritate an already sensitive stomach. The bubbles in soda can increase bloating. Alcohol relaxes the muscle between the stomach and esophagus, which can trigger reflux.
When Should You See a Doctor for an Upset Stomach?
Most upset stomachs resolve on their own within a few days. Some symptoms require medical attention. The CDC reports that about 48 million people get foodborne illness each year in the United States, and most recover without treatment. But certain signs should not be ignored.
See a doctor if you have:
- Blood in your vomit or stool
- Severe pain that does not go away
- Fever over 101 degrees Fahrenheit
- Signs of dehydration — dry mouth, dark urine, dizziness
- Vomiting that lasts more than 24 hours
- Diarrhea that lasts more than 3 days
These symptoms could indicate a bacterial infection, appendicitis, pancreatitis, or a blockage. OTC medicines will not help these conditions. Delaying treatment can make them worse.
People over 65, pregnant women, and those with weakened immune systems should be more cautious. Their bodies may not handle fluid loss as well. A simple stomach bug can become dangerous faster in these groups.
Chronic upset stomach that comes and goes over weeks or months may be something like irritable bowel syndrome, celiac disease, or an ulcer. A doctor can run tests to find the cause. Do not assume it is normal or just stress.
Common Misconceptions About Upset Stomach Remedies
Several popular beliefs about stomach relief are not backed by evidence. Here are a few that need correcting.
Apple cider vinegar for heartburn is a common internet claim. The idea is that vinegar balances stomach acid. This is widely claimed, but strong evidence is limited. In some people, vinegar actually worsens heartburn by directly irritating the esophagus. A study in Journal of Dental Research also found that vinegar can erode tooth enamel over time. It is not a reliable remedy.
Activated charcoal for gas and bloating is another trend. Some people report that it helps with gas, but clinical studies do not support this. A 2017 review in the American Journal of Gastroenterology found no consistent benefit for intestinal gas. Activated charcoal is useful for certain poisonings, not for routine stomach upset.
Drinking baking soda water is sometimes used as a DIY antacid. It does neutralize acid temporarily, but it can cause a dangerous spike in sodium levels. It also produces carbon dioxide gas in the stomach, which can cause sudden stomach expansion and even rupture in rare cases. Stick to commercial antacids that are properly dosed.
Cola syrup for nausea was once a home remedy. The sugar and phosphoric acid in cola can actually make nausea worse by irritating the stomach. Ginger ale made with real ginger is a better option, but most commercial ginger ales contain very little ginger and lots of sugar.
Frequently Asked Questions
What is the fastest way to settle an upset stomach?
For heartburn, an antacid like Tums works within minutes. For nausea, bismuth subsalicylate or ginger can help within 30 minutes. Rest and small sips of water also speed recovery.
Can I take Pepto-Bismol and Tums together?
Do not take them at the same time. Tums neutralizes acid, and Pepto-Bismol needs an acidic environment to work properly. Space them at least 2 hours apart.
Is ginger or peppermint better for nausea?
Ginger has stronger evidence for nausea specifically. Peppermint is better for gas and cramping. For nausea, ginger tea or capsules are the better choice.
How long should an upset stomach last before seeing a doctor?
See a doctor if vomiting lasts more than 24 hours, diarrhea lasts more than 3 days, or you have severe pain or fever over 101 degrees Fahrenheit.
