Why Am I So Gassy?

You are in a quiet meeting. Your stomach gurgles, loudly. Your belly feels tight. And the gas seems to have plans of its own. Sound familiar?

You are probably gassy because of a mix of what you eat, how you eat, and how sensitive your gut is. Some gas is normal: passing gas 10 to 18 times a day is considered normal (1). Swallowed air, carbohydrates that bacteria ferment in your colon, constipation, and a sensitive gut are the usual reasons for more (1,2). Hormones can play a part for women, and sometimes a medical condition is behind it.

This article is part of our complete guide to bloating and gas. Below you will find the main causes, what is different for women, why you can feel bloated after eating very little, and what can help.

written and reviewed by Anouk Martini (registered dietician)

In short

Passing gas 10 to 18 times a day is normal, and most of it is made by bacteria in your colon (1).
The main causes of excess gas are swallowed air, fermentable carbohydrates, constipation, and a sensitive gut (1,2).
In women, hormones can slow the gut and make gas symptoms worse around your period (3,4).
Bloating after a small meal often has more to do with how your gut handles food than with how much you ate (2,5).
Simple habits help many people, and a doctor can check for other causes if symptoms are new or getting worse (5).

What is gassiness?

Gassiness is an everyday word for gas symptoms that bother you: burping, passing gas, a gurgling stomach, and a bloated or swollen belly. Gas is the air and gases in your digestive tract. Flatulence is gas made by bacteria in your bowel and passed rectally (1). Bloating is the feeling of fullness or pressure, and a visibly swollen belly is called distention. Belching, bloating, and distention are some of the most common reasons people see a gastroenterologist (5).

Why do I pass gas so much?

Most of the gas you pass is made by bacteria in your colon, with some swallowed air mixed in (1). Passing gas, also called passing wind or flatulence, 10 to 18 times a day is considered normal. The main gases are odorless. Noticeable smells come from trace gases related to what you eat (1).

You may notice more gas after a high-fiber day, after beans, or when you are constipated. Passing wind far more often than this, or with pain, is a reason to look for the cause.

Why do I have so much gas?

Usually it is a combination of the causes below. Each one adds a little.

Swallowed air

We all swallow air while we eat. You swallow more when you eat or drink fast, chew gum, suck on hard candy, drink carbonated drinks, or do not chew your food well. Poorly fitting dentures, nervous tension, and postnasal drip also play a part (1).

Foods your gut ferments

Carbohydrates that are poorly absorbed in your small intestine reach your colon. Bacteria ferment them there and make gas (2). These carbohydrates are called FODMAPs. Beans, onions, wheat, dairy, and some fruits are typical examples. Read more in our article on foods that cause gas.

Constipation

When stool moves slowly, gas can build up behind it. If constipation is part of the picture, treating it can help with bloating too (5).

A sensitive gut

Some people make normal amounts of gas but feel it more. In people with visceral hypersensitivity, the gas made by fermentation can cause symptoms (2). That is why two people can eat the same meal and feel very different afterward.

Stress and anxiety

Nervous tension can make you swallow more air (1), and your gut and brain talk to each other all day. A doctor may suggest gut-directed therapies, such as breathing exercises or cognitive behavioral therapy, for belching and bloating (5).

Medical causes

Sometimes a condition is behind excess gas. A doctor can check for celiac disease with a blood test, look for lactose or other carbohydrate trouble with a diet change or a breath test, and look at pelvic floor problems if you struggle to empty your bowels (5). Small intestinal bacterial overgrowth (SIBO) is tested only in a small group of people at risk (5).

What are the causes of excessive gas in females?

Women are not gassier by default, but hormones can change how your gut works. A 2015 review found that in healthy women, the gut moves food more slowly in the luteal phase, the second half of the menstrual cycle (3). In a 2014 survey of 156 healthy women, 73% had at least one gut symptom, such as abdominal pain, diarrhea, constipation, or nausea, before or during their period (4).

For women with IBS, bloating and pain often get worse around menstruation. Prostaglandins and a more sensitive gut may play a role (3). IBS is also more common in women (1).

Track your symptoms next to your cycle for two or three months. A clear pattern helps you plan around it and gives your doctor useful information.

Why do I feel bloated after eating very little?

Bloating after a small meal usually says more about how your gut handles food than about how much you ate. These are the common reasons:

Constipation. A backed-up colon leaves little room for anything else.
A sensitive gut. Even a small amount of gas can feel big (2).
Swallowed air. A quick snack on the go, with a fizzy drink, can add a lot of air (1).
Muscle coordination. In some people, the muscles of the belly, the diaphragm, or the pelvic floor do not work well together, and the belly swells. A doctor can assess this, and breathing exercises or biofeedback may help (5).

If you also have nausea, vomiting, or lose weight without trying, see a doctor soon.

What helps with bloating and gas?

There is no single fix, but small habits help many people. Start with a few of these:

Eat slowly, chew well, and cut back on gum, hard candy, and fizzy drinks (1).
Take a short, relaxed walk after meals. Light activity may help gas move through your gut (6).
Keep a food and symptom diary for two weeks to spot your triggers.
Try our intolerance test for an indication of which food components may play a role for you.
Add fiber slowly and drink more fluids as you do (1).
Treat constipation if you have it (5).
Try slow, deep breathing. It helps you relax and is used in therapy for some belching and bloating problems (5).
Be careful with probiotics. The American Gastroenterological Association (AGA) does not recommend them for treating bloating (5).
If you want to try a low FODMAP approach, do it with a dietitian (5). You can read more in our FODMAP guide.

What does a digestive enzyme blend like Fodmix do?

Digestive enzymes are proteins that help break down food. Lactase splits lactose into glucose and galactose in the small intestine. The enzyme alpha-galactosidase splits galactans, such as the raffinose in beans. Enzyme supplements provide specific enzymes that you take with a meal.

Fodmix (Quatrase 10,000) is an enzyme blend developed by our in-house dietitians. It contains Alpha Galactosidase (1200 u), Xylose Isomerase (7500 u), Lactase (10,000 FCC), and Invertase (500 u). Fodmix helps reduce occasional gas, bloating, and discomfort, allowing you to enjoy meals without restrictive diets.*

The capsules are easy to twist open, so you can take the powder separately or mix it with water. Fodmix is suitable for children aged 2 and up, vegan, and free of gluten and soy. It is Low FODMAP Certified™ by Monash University.

*This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

When should you talk to a doctor or dietitian?

Talk to a doctor if your gas or bloating is new, gets worse, or comes with other symptoms. A doctor can check for celiac disease, lactose and other carbohydrate trouble, and causes related to constipation (5).

Do your symptoms persist, are you losing weight without trying, or are you cutting out more and more foods? Talk to your doctor or a dietitian. You can also ask our dietitians a question.

Not sure where to start with gas and bloating? Our dietitians are happy to think along with you. You can also use the supplement advisor to see which supplement fits your situation.

Sources

American College of Gastroenterology. Digestive health tips: 10 tips on belching, bloating, and flatulence [Internet]. Bethesda (MD): American College of Gastroenterology. Available from: https://gi.org/topics/digestive-health-tips/
Staudacher HM, Whelan K. The low FODMAP diet: recent advances in understanding its mechanisms and efficacy in IBS. Gut. 2017;66(8):1517-27. doi:10.1136/gutjnl-2017-313750
Bharadwaj S, Barber MD, Graff LA, Shen B. Symptomatology of irritable bowel syndrome and inflammatory bowel disease during the menstrual cycle. Gastroenterol Rep (Oxf). 2015;3(3):185-93. doi:10.1093/gastro/gov010
Bernstein MT, Graff LA, Avery L, Palatnick C, Parnerowski K, Targownik LE. Gastrointestinal symptoms before and during menses in healthy women. BMC Womens Health. 2014;14:14. doi:10.1186/1472-6874-14-14
Moshiree B, Drossman D, Shaukat A. AGA clinical practice update on evaluation and management of belching, abdominal bloating, and distention: expert review. Gastroenterology. 2023;165(3):791-800.e3. doi:10.1053/j.gastro.2023.04.039
Villoria A, Serra J, Azpiroz F, Malagelada JR. Physical activity and intestinal gas clearance in patients with bloating. Am J Gastroenterol. 2006;101(11):2552-7. doi:10.1111/j.1572-0241.2006.00873.x