Why Am I Always Gassy? 8 Common Causes (and What to Do)

Some gas is completely normal — it's a natural byproduct of digestion. But if you're gassy constantly, it gets uncomfortable and frustrating fast. The good news is that excess gas is almost always caused by a handful of fixable things. Here are eight of the most common, and what to do about each.

1. Swallowing air

A surprising amount of gas comes from the top. When you eat quickly, talk while eating, chew gum, drink through a straw or gulp fizzy drinks, you swallow air that travels through your digestive system and has to come out. Fix: slow down when you eat, chew with your mouth closed, and ditch the straws and gum.

2. High-FODMAP foods

FODMAPs are fermentable carbs your small intestine can't fully absorb, so gut bacteria ferment them in your colon and produce gas. Onions, garlic, beans, lentils, apples, wheat and dairy are common culprits. Fix: try easing off the most common FODMAP foods for a couple of weeks. See our guide to foods that cause bloating.

3. Too much fibre too fast

Fibre is good for you, but dramatically increasing it overnight gives gut bacteria a lot to ferment at once. Fix: increase fibre gradually, over several weeks, and drink more water alongside it.

4. Constipation

When things aren't moving, gas gets backed up too. The longer waste sits in your colon, the more fermentation happens. Fix: drink more water, increase fibre gently, and move your body — even a daily walk helps.

5. Lactose intolerance

If you're low on the enzyme that breaks down lactose, dairy produces a lot of gas as bacteria ferment it instead. Fix: try cutting dairy for a week and see if it helps. Lactose-free dairy and hard aged cheeses are lower-lactose alternatives.

6. Carbonated drinks

Every bubble in a fizzy drink is gas entering your stomach. It has nowhere to go but through. Fix: swap for still water or herbal teas. Even sparkling water adds to it if you're sensitive.

7. Eating very large meals

A lot of food at once gives your digestive system more to process than it can handle comfortably, leading to more fermentation and gas. Fix: eat smaller, more frequent meals and don't rush them.

8. Stress

The gut-brain connection is real: anxiety and stress slow digestion and can make your gut more sensitive and gassy. Fix: slow breathing before meals, gentle movement, and managing stress more broadly all help — see our guide to stress and bloating.

When to see a doctor

Occasional gas is normal. But see a doctor if it's constant and severe, comes with significant pain, blood in your stool, unexplained weight loss, or a lasting change in your bowel habits.

Getting on top of it

Most excess gas comes down to a few foods and habits stacking up. My free 7-day anti-bloat plan gives you a simple structured way to work through the common culprits. And if you suspect it's part of a wider gut picture, our guide to signs of an unhealthy gut is worth reading.

Frequently asked questions

Is it normal to be gassy every day?

Some gas every day is completely normal. Passing gas a handful of times a day is ordinary digestion. It's the constant, uncomfortable, hard-to-manage excess that's worth addressing.

What foods cause the most gas?

Beans, lentils, onions, garlic, cruciferous vegetables, wheat, dairy and sugar-free sweeteners are the biggest producers of gut gas for most people.

Does drinking water reduce gas?

It helps with constipation-related gas and supports smoother digestion overall. Sip steadily rather than gulping large amounts at once.