Why We Fart When Walking: What Is Normal and When to Worry

Hardly any subject feels quite so embarrassing.

If you regularly pass wind while out walking or on your commute, it is easy to wonder whether this is still normal or whether a medical problem could be behind it. Usually, the truth lies somewhere in between. Your body may be giving you signals worth noticing, but there is no need to panic straight away.

Why we fart when walking

Flatulence – the release of intestinal gas through the anus – is entirely normal. However, many people notice that they pass wind more often when walking. There are several explanations for this.

Movement gets the bowel going

When we are sitting or standing still, gas can collect in particular areas of the bowel. Once we start walking, the bowel quite literally begins to move. The intestinal muscles become more active, the bowel contents shift and gas travels downwards before leaving the body as flatulence.

“Movement acts like a gentle massage for the abdomen: gases that had previously been ‘stuck’ start making their way out.”

While walking, we also tend to breathe more deeply and the diaphragm moves more. This changes the pressure inside the abdomen, making it even easier for gas to move through the bowel.

How intestinal gas forms in the first place

The air in the abdomen does not come solely from swallowing air. A substantial proportion is produced in the large intestine:

• Undigested carbohydrates, such as fibre, reach the large intestine.
• Bacteria break down these substances there.
• This process creates gases as a by-product, including carbon dioxide, hydrogen and methane.

Some of these gases are reabsorbed by the body and breathed out, while the remainder leaves the body as flatulence. This happens every day in every person.

How much farting is still normal?

Doctors assume that a healthy person can pass wind up to 20 times a day on average without this being a sign of illness. We do not even notice every release of gas ourselves, as many are quiet and odourless.

What matters less, therefore, is the exact number and more whether you can answer yes to any of these questions:

• Has the flatulence suddenly become much more frequent than it used to be?
• Is it accompanied by pain, cramps or changes in bowel movements?
• Are you experiencing intense pressure, nausea or particularly foul-smelling gas?

If the answer is “Yes” to these points, it is worth looking more closely at whether lifestyle, diet or an illness could be responsible.

Typical triggers: from beans to office stress

Foods that produce particularly large amounts of gas

For many people, food is the main factor. Certain foods are well known for producing plentiful gas in the large intestine:

• Pulses such as beans, lentils and chickpeas
• Cabbage vegetables, including white cabbage, Brussels sprouts and broccoli
• Onions, leeks and garlic
• Large quantities of wholegrain products
• Foods containing fructose, for example apple juice, soft drinks and dried fruit
• Sugar alcohols such as sorbitol, xylitol and mannitol in “sugar-free” chewing gum and sweets

Anyone eating these foods at lunchtime or during the afternoon will often notice the effects on the walk home or during a post-meal walk – precisely when movement encourages the gas to travel downwards.

Swallowing air in daily life

Swallowed air is another source of intestinal gas. It can enter the stomach, and subsequently the bowel, when you eat too quickly, speak while chewing or drink through a straw. Fizzy drinks intensify the effect. Some of this air comes back out through burping, while the rest moves towards the bowel and may emerge as flatulence during a walk.

Stress and nervousness

The bowel is highly sensitive to emotional strain. Many people are familiar with diarrhoea before an exam or abdominal cramps during stressful periods. Increased flatulence can also be part of this response. Bowel movements change, digestion becomes unsettled and this may become noticeable while walking to the station.

When flatulence can be a warning sign

Most of the time, passing wind when walking is more irritating than dangerous. However, there are situations in which flatulence may point to a problem within the digestive system.

Food intolerances

A lot of gas after particular foods can indicate an intolerance, for example:

• Lactose intolerance: the body does not break down milk sugar sufficiently. Typical symptoms include flatulence, abdominal pain and diarrhoea after milk, yoghurt or ice cream.
• Fructose malabsorption: fructose from fruit, juices or sweets remains in the bowel and ferments. This can cause considerable gas production.
• Sorbitol intolerance: sorbitol is found in light products, “sugar-free” chewing gum and some foods marketed for people with diabetes.

If you experience flatulence on walks almost every time certain products have been on the menu, keeping a food diary and discussing the pattern with a doctor may be helpful.

Irritable bowel syndrome and other bowel conditions

Accompanying symptoms are a clear indication that there could be more to it. Warning signs include:

• persistent or recurring abdominal pain
• changing bowel habits, including diarrhoea, constipation or alternating between the two
• unintended weight loss
• blood in the stool or very dark stools
• fever or feeling seriously unwell

In these cases, possible causes include irritable bowel syndrome, inflammatory bowel disease or other physical conditions. At that point at the latest, the issue should be assessed by a doctor.

“Silly jokes about farts are harmless – persistent, painful flatulence is not and should be medically investigated.”

What you can do about flatulence when walking

Adjust your diet purposefully

If you notice that particular foods are causing problems, you can try reducing or avoiding them for one to two weeks. A food diary can help identify patterns. Useful measures include:

• eating meals calmly and chewing thoroughly
• cutting down on fizzy and very sugary drinks
• serving very gas-producing foods in smaller portions and spreading them out
• increasing fibre gradually rather than changing your diet overnight

Anyone planning to make fundamental dietary changes should ideally seek support from a doctor or nutrition professional to avoid nutritional deficiencies.

Use movement wisely

Although it may seem contradictory, physical activity can trigger the immediate release of gas but reduce the feeling of bloating over time. Gentle exercise such as walking, cycling or easy jogging promotes more regular bowel activity. Many people find that a short walk after a meal noticeably relieves abdominal pressure.

If you know that brisk walking can quickly lead to air escaping, choosing routes away from busy areas may reduce the stress of being “caught”.

Smell, sound and pain: what passing wind can reveal

Not all flatulence feels the same. Some episodes are noisy, while others are barely audible. Some have little smell and others are very pungent. Different processes in the bowel can be responsible.

Feature	Possible cause
Odourless but frequent	swallowing a lot of air, fizzy drinks
Strong-smelling	a protein-rich diet, certain vegetables, holding gas in for a long time
With sharp pain	trapped air, a spasming bowel, possibly an intolerance
Sudden and accompanied by diarrhoea	an infection, spoiled food, severe irritation of the intestinal lining

Anyone who repeatedly experiences cramping pain while walking should arrange a medical examination, even if the symptoms pass.

How to feel more relaxed about it

Embarrassment often makes the problem worse. If you tense your buttocks because you fear making a noise, you artificially hold gas back. It can then build up in the bowel, cause pain and escape even more forcefully later. A degree of relaxation is therefore genuinely healthier.

Small day-to-day strategies may help, including:

• going to the toilet shortly before important appointments
• choosing aisle seats in the office or on the train, so you can move around briefly if needed
• avoiding tight trousers around the abdomen when your bowel is already sensitive

Approaching the subject with humour, without being disrespectful – for instance with close friends, partners or colleagues – can take the pressure off. Many people discover that almost everyone knows the problem, but hardly anyone talks about it.

When specialist knowledge helps

Terms such as flatulence, irritable bowel syndrome and fructose malabsorption may sound unwieldy, but they describe processes that many people experience in everyday life. Flatulence simply means intestinal gas that escapes. Irritable bowel syndrome is an umbrella term for functional symptoms such as bloating, pain and irregular bowel movements, where no clear physical cause is found despite the symptoms. Fructose malabsorption means that the small intestine can absorb fructose only to a limited extent, leading to fermentation processes and flatulence in the large intestine.

Having a basic understanding of these connections can make it easier to interpret the body’s signals. An occasional rumbling abdomen during a walk is usually no reason for concern. However, if flatulence becomes a constant companion, restricts quality of life or occurs alongside other symptoms, it is worth speaking to your GP – even if the subject feels embarrassing.