Stomach pain and bloating happening together usually comes down to excess gas, slowed digestion, or your gut reacting to something you ate. In most cases, the cause is benign and temporary. But when these symptoms keep returning or get worse over time, they can point to conditions like irritable bowel syndrome, food intolerances, or hormonal shifts that deserve a closer look.
The Most Common Causes
The simplest explanation is often the right one. Overeating, swallowing air (from eating too fast, chewing gum, or drinking through a straw), and constipation are the top triggers for that uncomfortable full, tight feeling in your abdomen. Carbonated drinks and high-fiber meals can also produce a noticeable spike in gas.
Beyond the everyday culprits, several diagnosable conditions cause recurring pain and bloating:
- Irritable bowel syndrome (IBS) affects roughly 11 to 13% of the global population. It’s diagnosed when you have abdominal pain at least one day per week for three months, and that pain is linked to changes in how often you go to the bathroom or what your stool looks like.
- Lactose intolerance and other food sensitivities cause bloating because your body can’t fully break down certain sugars, leaving them for gut bacteria to ferment.
- Small intestinal bacterial overgrowth (SIBO) happens when too many bacteria colonize the upper part of your gut, producing gas in a place where it doesn’t normally accumulate.
- Gastroesophageal reflux (GERD) can cause upper abdominal pressure and bloating alongside the more familiar heartburn.
- Celiac disease triggers an immune reaction to gluten that damages the intestinal lining, leading to pain, bloating, and poor nutrient absorption.
Certain medications contribute too. The diabetes drug acarbose, sugar alcohols like sorbitol (common in sugar-free products), and lactulose-based laxatives all increase fermentation in the gut.
Why Gas Hurts Some People More Than Others
Your body produces anywhere from 200 to 2,000 milliliters of intestinal gas per day. That’s a huge range, and even at the higher end, most people don’t feel much discomfort. The difference often isn’t how much gas you’re making. It’s how sensitive your gut is to normal amounts of pressure.
A condition called visceral hypersensitivity explains why. In people with this heightened nerve response, normal amounts of gas, fluid, or food moving through the intestines trigger pain signals that other people simply wouldn’t notice. The nerves lining the gut become hyper-reactive, sometimes after an infection, a period of intense stress, or another event that “primed” the nervous system. Even after the original trigger resolves, those nerves keep interpreting routine sensations as pain and relaying that message to the brain.
This is one reason two people can eat the same meal and react completely differently. It also helps explain why stress and anxiety tend to make bloating feel worse: the emotional processing centers in the brain are directly connected to the visceral pain pathway.
How Certain Foods Create Gas and Distention
A group of carbohydrates collectively called FODMAPs are the biggest dietary drivers of bloating. These are short-chain sugars found in foods like onions, garlic, wheat, beans, apples, and dairy. Your small intestine struggles to absorb them fully, so it draws in extra water to push them along. When they reach the large intestine, bacteria ferment them rapidly, producing gas and fatty acids as byproducts.
For people with a sensitive gut, this combination of extra water and gas stretches the intestinal walls and creates that painful, distended feeling. A low-FODMAP elimination diet, where you temporarily cut out high-FODMAP foods and reintroduce them one at a time, is one of the most effective ways to identify your personal triggers. It’s not meant to be permanent. The goal is to figure out which specific foods cause problems and in what amounts.
Fructose deserves a special mention. High-fructose corn syrup and fruit juices can overwhelm the gut’s absorption capacity even in people without a diagnosed intolerance, producing bloating that seems to come out of nowhere.
Hormonal Bloating During Your Cycle
If your bloating follows a monthly pattern, reproductive hormones are a likely factor. Estrogen and progesterone fluctuate significantly across the menstrual cycle, and both directly influence how fast food moves through your digestive tract.
During menstruation, when estrogen and progesterone drop to their lowest levels, gut transit speeds up. Faster transit means fewer carbohydrates get absorbed in the small intestine, so more of them reach the colon where bacteria ferment them into gas. This is why the days around your period often bring the worst combination of bloating, cramping, loose stools, and flatulence. In the luteal phase (the two weeks before your period), progesterone slows things down, which can swing the other way toward constipation and a different kind of bloating: that heavy, backed-up sensation.
Relief Options That Actually Work
For occasional bloating, over-the-counter gas relief tablets containing simethicone can help. Simethicone works by breaking up gas bubbles in the stomach and intestines so they’re easier to pass. Adults typically take 60 to 125 mg after meals and at bedtime, up to four times a day, with a ceiling of 500 mg in 24 hours.
Peppermint oil capsules (enteric-coated so they dissolve in the intestine, not the stomach) can relax the smooth muscle of the gut wall and reduce spasms. Walking after meals, eating more slowly, and avoiding carbonated drinks are low-effort changes that make a real difference for many people. If constipation is the root cause, increasing water intake and gradually adding soluble fiber often resolves the bloating within a few days.
For chronic or recurring symptoms, the low-FODMAP approach mentioned above has the strongest evidence base, particularly for people with IBS. A dietitian can guide the elimination and reintroduction phases so you don’t unnecessarily restrict your diet long-term.
Signs That Something More Serious Is Going On
Most bloating is uncomfortable but harmless. A few patterns, however, warrant prompt attention:
- Bloating that gets progressively worse over days or weeks rather than coming and going
- Unintentional weight loss alongside persistent bloating
- Fever, vomiting, or blood in your stool
- Severe pain that doesn’t improve after passing gas or having a bowel movement
- Symptoms lasting more than a week without a clear dietary explanation
These can signal conditions ranging from pancreatic insufficiency (where your body doesn’t produce enough digestive enzymes) to ovarian cancer, which notoriously presents as persistent, unexplained bloating in its early stages. Fluid buildup in the abdomen, called ascites, can also mimic bloating but feels different: the swelling is constant and doesn’t fluctuate with meals or gas. If any of these red flags apply, getting evaluated sooner rather than later matters.