Bloating and constipation often travel together, and fixing one usually helps the other. When stool moves too slowly through your intestines, bacteria have more time to ferment undigested food, producing excess gas that gets trapped behind the backup. The result is that pressurized, distended feeling in your abdomen. The good news: a combination of dietary changes, movement, and targeted supplements can break the cycle, often within days.
Why Bloating and Constipation Feed Each Other
Your colon is home to billions of bacteria that break down whatever your small intestine didn’t fully digest: lactose, fructose, certain sugars in beans, fiber, and complex carbohydrates like wheat. That fermentation process naturally produces gas. When your bowels are moving at a normal pace, that gas passes through without much trouble.
Constipation changes the equation. Slow-moving stool gives bacteria extra time to ferment, generating more gas than usual. At the same time, the physical backup makes it harder for that gas to move through and exit your body. People with constipation are measurably less able to evacuate intestinal gas, which is why bloating and abdominal pain so often come as a package deal. Addressing the constipation directly is the single most effective way to reduce bloating.
Choose the Right Type of Fiber
Not all fiber works the same way. Insoluble fiber, found in wheat bran, rye, and inulin supplements, can actually make bloating and gas worse even as it adds bulk to stool. One study found that wheat bran improved bloating but made flatulence worse, which isn’t much of a trade-off if you’re already uncomfortable.
A better option for most people is a mixed soluble and insoluble fiber blend, or psyllium husk on its own. Both increase the number of complete bowel movements per week, but in a clinical trial comparing the two, mixed fiber was significantly more effective at relieving both flatulence and bloating. Over half of participants on mixed fiber (53%) reported improved gas symptoms, compared to just 25% on psyllium alone. Psyllium still works well for constipation, but if bloating is your main complaint, a mixed fiber supplement or foods rich in soluble fiber (oats, flaxseed, citrus fruits) may be the better starting point.
Current dietary guidelines recommend 14 grams of fiber per 1,000 calories you eat daily. For most adults, that lands somewhere around 25 to 35 grams per day. If you’re currently eating much less than that, increase gradually over one to two weeks. A sudden jump in fiber intake will temporarily worsen bloating before it helps.
Drink Enough Water to Make Fiber Work
Fiber without adequate fluid can make constipation worse, not better. Fiber absorbs water to soften stool, so if there isn’t enough water available, you end up with drier, harder stools that are even more difficult to pass. A study of adults with chronic functional constipation found that eating 25 grams of fiber per day improved stool frequency on its own, but the effect was significantly enhanced when participants drank 1.5 to 2 liters of water daily. The group drinking about 2 liters had meaningfully better outcomes than those drinking around 1 liter. If you’re increasing your fiber intake, aim for at least 1.5 liters (roughly 50 ounces) of water per day, spread throughout the day rather than consumed all at once.
Use Movement to Release Trapped Gas
Physical movement helps on two fronts: it stimulates the muscular contractions that push stool through your colon, and certain positions physically compress the abdomen to help trapped gas escape. You don’t need an intense workout. A 20-minute walk after meals is one of the simplest ways to keep things moving.
For more targeted relief, specific yoga-style positions are particularly effective. The knees-to-chest pose (lying on your back and pulling both knees toward your chest) puts gentle pressure on your abdomen and helps dislodge trapped gas. Supine spinal twists, where you lie on your back and drop your knees to one side, compress the abdomen and encourage gas to pass through. Child’s pose presses your torso against your thighs, combining abdominal pressure with hip and lower back relaxation. Even a few minutes in these positions can provide noticeable relief when you’re feeling particularly distended.
Try a Low-FODMAP Elimination
If fiber adjustments and hydration aren’t enough, the foods you’re eating may be the primary gas source. FODMAPs are a group of short-chain carbohydrates that ferment rapidly in the colon. They’re found in foods like garlic, onions, apples, wheat, milk, and many beans and lentils. A two-week elimination of high-FODMAP foods reduced bloating by 56% in clinical testing.
The low-FODMAP approach isn’t meant to be permanent. You eliminate the major categories for two to six weeks, then reintroduce them one at a time to identify which specific foods trigger your symptoms. Many people find they’re sensitive to only one or two categories, meaning they can return to eating most foods without issue. Free FODMAP food lists from universities like Monash can guide you through the process.
Probiotics That Actually Speed Transit
The probiotic market is overwhelming, but the evidence for specific strains varies enormously. A meta-analysis of randomized controlled trials found that two strains stood out for reducing intestinal transit time: Bifidobacterium lactis HN019 and Bifidobacterium lactis DN-173 010. Both produced statistically significant, medium-to-large effects on how quickly food moved through the digestive tract. Other single strains and combination products showed only small effects that weren’t statistically significant.
If you’re shopping for a probiotic specifically to address constipation, look for products that list one of these strains on the label. Generic “digestive health” probiotics with unspecified blends are less likely to help. Give any probiotic at least three to four weeks before deciding whether it’s working.
Peppermint Oil for Gas and Cramping
Enteric-coated peppermint oil capsules relax the smooth muscle in your intestinal wall, which helps trapped gas pass through more easily and reduces the cramping that often accompanies bloating. The enteric coating is important because it prevents the capsule from dissolving in your stomach (which can cause heartburn) and delivers the peppermint oil to your intestines where it’s needed. The standard dose is one capsule three times a day, increasing to two capsules three times a day if needed. These are available over the counter at most pharmacies.
Over-the-Counter Laxatives
When you need faster relief, two main types of laxatives are available without a prescription, and they work very differently. Osmotic laxatives (like polyethylene glycol, sold as MiraLAX and similar brands) draw water into the stool, making it softer and easier to pass. They also gently increase the wave-like contractions of the colon. These are generally the first choice for ongoing constipation because they’re well tolerated and work with your body’s natural processes.
Stimulant laxatives (like bisacodyl or senna) take a more aggressive approach, directly triggering stronger muscle contractions in the intestinal wall while also increasing fluid secretion. They work faster but are better suited for occasional use rather than daily reliance. If you find yourself needing any laxative regularly for more than two weeks, that’s worth discussing with a healthcare provider.
How to Tell If Your Stool Pattern Is Normal
The Bristol Stool Scale is a simple visual guide that doctors use to classify stool consistency on a scale of 1 to 7. Types 1 and 2, which look like hard lumps or a lumpy sausage shape, indicate constipation. These stools are dry, hard, and difficult to pass, typically because they’ve spent too long in the intestines and lost too much water. Types 3 and 4 (smooth, sausage-shaped stools) are considered ideal. If you’re consistently producing type 1 or 2 stools, that’s confirmation that slow transit is likely contributing to your bloating.
Red Flags Worth Checking Out
Most bloating and constipation responds well to the strategies above. But certain symptoms alongside bloating signal something that needs medical evaluation: unexplained weight loss, blood in your stool or bleeding from your bottom, a hard lump or swelling you can feel in your abdomen, shortness of breath, heart palpitations, or unusually pale skin. A sudden, persistent change in bowel habits after age 50 also warrants a check. These don’t necessarily mean something serious is wrong, but they do need to be ruled out.