Is it bad to hold in a fart? What really happens when you clench

What you feel in that desperate moment is pressure: gas has accumulated in your rectum and is pushing against your internal anal sphincter — the involuntary muscle that normally keeps things where they belong. Your body sends a clear message: “we should release this soon.” And your conscious brain overrides it, engages the voluntary external sphincter, and clenches. So… then what? The gas doesn't vanish. It goes to one of three places.

The 3 places held-in gas actually goes

Option 1: It waits — and files a grievance

Most of the time, the gas sits in your rectum, redistributing slightly through your colon so the urgency temporarily fades. But it hasn't gone anywhere; it's waiting in the queue, building pressure. This is why the post-meeting bathroom visit can be so… dramatic. An hour of accumulation finally finds the exit, and it is not subtle about it.

Option 2: It gets reabsorbed into your bloodstream (yes, really)

This is the part that genuinely surprises people: some held-in gas is reabsorbed through your intestinal walls into your bloodstream, travels to your lungs, and gets exhaled through your breath. Before you panic: the amounts are tiny, and it's mostly odorless hydrogen and methane that make the trip — the sulfur compounds responsible for smell tend to get broken down in the colon wall and don't reach your lungs. Nobody around you can detect it; it's diluted twice over. (Fun footnote: this same hydrogen reabsorption is the basis of real medical breath tests used to diagnose conditions like lactose intolerance and SIBO. Cool science, weird application.)

Option 3: It travels backward

Clench with enough determination and pressure can push gas backward through your colon, spreading it out through your intestines while it looks for somewhere to go. That's the distended, tight, whole-abdomen bloat — and it's also a major source of those loud gurgles your stomach produces at the worst possible moments. There's real irony in holding gas in to avoid embarrassment, only to have your gut produce a sound like an angry whale call in a silent room. Everyone turns to look anyway.

What holding it in does to your body

• Bloating and visible distension — your abdomen literally expands to accommodate the volume. People describe it as feeling “inflated like a balloon.”
• Surprisingly intense pain. Gas pockets trapped at the bends of your colon can hurt sharply — and convincingly mimic other problems. Gas trapped up near your spleen on the left can feel like chest or heart trouble; near the liver on the right, like gallbladder pain. I've genuinely seen people arrive at the pharmacy worried about a heart attack who were carrying one very large, very stubborn pocket of gas. (The reassuring tell: gas pain usually moves around and improves after release — but never assume chest pain is gas; get real symptoms checked.)
• Constant low-grade tension. All-day clenching keeps your pelvic floor tight and your attention hijacked — you can't fully relax, and the tension itself makes normal digestion harder. You're manufacturing a traffic jam.

The chronic clencher problem

Holding it in occasionally — the meeting, the date — causes no lasting damage. Your system handles it. But training yourself to never pass gas outside your own home, every day for years, is different. Chronic distension can gradually stretch your intestines and reduce normal muscle tone. Your gut can become hypersensitive, registering completely normal amounts of gas as uncomfortable bloating. And constantly fighting peristalsis — your gut's natural rhythm — disrupts the motility that keeps everything, gas included, moving on schedule.

In short: your grandmother's warning was exaggerated, but she was onto something. The gas always wins eventually. The only negotiation is when and where.

So… is it actually harmful?

The honest pharmacist's verdict: occasionally, no — habitually, yes, in quality-of-life terms. Nobody's intestines explode from a held fart, and the reabsorbed gas doesn't poison you. But chronic holding produces real, ongoing bloating, pain, disrupted motility, and gut hypersensitivity — a steep price for permanent politeness. If frequent urges are forcing you into constant clenching, the better fix is upstream: reduce the volume of gas you're producing in the first place (here's what drives the volume) and move trapped gas out promptly when it builds (nine remedies that work fast).

The pharmacist's guide to graceful gas management

• Use the buffer. A bathroom trip before the long meeting or the flight clears the queue while you have privacy. Strategic, not shameful.
• Walk it forward. Movement stimulates peristalsis — a quick hallway walk often moves gas to a point where it can wait comfortably or exit discreetly.
• Don't suppress all day. Find moments. Step outside. Take the stairs nobody uses. Your gut needs the release valve used, not welded shut.
• Prevent the rush hour. Slower eating, fewer carbonated drinks, gradual fiber increases, enzymes when needed — the less gas produced, the fewer standoffs you'll face.

To fart is human; to laugh about it is divine. To hold it in for eight hours straight is just a traffic jam with a dress code.

Quick answers (FAQ)

Where does a fart go when you hold it in?

Three places: most of it waits in your rectum and redistributes through your colon (often exiting later “with a vengeance”); some travels backward through your colon, causing bloating and gurgling; and a small portion is genuinely reabsorbed through your intestinal wall into your bloodstream and eventually exhaled through your lungs — in tiny, completely undetectable amounts.

Can holding in farts hurt you?

Occasionally holding gas in — during a meeting or a date — causes no lasting harm, just temporary pressure, bloating, and sometimes surprisingly sharp pain. Habitually holding it in all day, every day, is a different story: chronic distension, disrupted motility, heightened gut sensitivity, and constant discomfort. The gas always wins eventually; the only question is when and where.

Why does trapped gas hurt so much?

Gas stretches the intestinal wall, and your gut registers stretch as pain. Pockets trapped at the bends of your colon — near the spleen on the left or liver on the right — can mimic chest, heart, or gallbladder pain convincingly. Gas pain typically moves around and improves after passing gas or a bowel movement; pain that is severe, persistent, or accompanied by fever or blood needs medical evaluation.

Isaac Annan, RPh

Registered Pharmacist with 22+ years of clinical experience across long-term care and retail pharmacy. Author of From Chew to Phew and founder of Laughing Gut Media. Chapter 7 — “When Holding It In Bites Back” — tells the complete story of the clench, the reabsorption, and the aftermath. Get it on Kindle.