# SIBO Symptoms: The 5 Real Causes Behind Constipation Nobody Explains

> SIBO symptoms like constipation are often misdiagnosed. Kieran breaks down 5 real causes behind slow motility, from methane overgrowth to low stomach acid.

- Source: https://gutfix.ai/blog/sibo-symptoms-constipation-causes
- Author: Kieran, GutFix co-founder (https://gutfix.ai/about)
- Published: 2026-09-04
- Category: SIBO
- Reading time: 3 min

You know you have constipation by the bloated, backed up and gassy feeling. Did anyone explain to you what it really was? 60-90% of people with "IBS" actually have a methane dominant microbial overgrowth, and this makes motility 59% slower.

## Key takeaways

- 60-90% of people with "IBS" actually have a methane dominant microbial overgrowth. this makes motility 59% slower.
- Low stomach acid is actually a leading cause of slow motility.
- We've all heard stress slows down movement. When your brain sends off the signal for a stressor, your motility becomes 30-45% slower.

## What Is the Methane Overgrowth Behind Constipation?

60-90% of people with "IBS" actually have a methane dominant microbial overgrowth. this makes motility 59% slower. Of course the methane overgrowth is fed by a hydrogen overgrowth, Atrantil + Quercetin + Red yeast rice (with coq10) hit the methanogens at their source.

## Why Does Low Stomach Acid Slow Down Motility?

Low stomach acid is actually a leading cause of slow motility. If there isn't enough acid when entering the small intestine secretin, which controls movement, is not triggered. On top of this bile isn't triggered to be released meaning even slower motility. Simple one for this is betaine + enzymes as well as Aloe + DGL.

## How Does a Damaged Gut Lining Affect Movement?

A damaged gut lining in some people can lead to slower motility, because there is damage to receptors and nerves which should normally stimulate movement, Less of these cells = food sits and ferments longer. Zinc L carnosine, Butyrate and Colostrum can help with this.

## Why Has Coffee Stopped Working for Your Motility?

What if you've been using coffee for motility? But it's just stopped working? Turns out your body can actually become desensitised to not just coffee, but it's own motility transmitters. When you drink coffee it stimulates massive waves of these hormones/transmitters, eventually your body relies on it and stops producing its own.

## Can Stress Really Slow Down Gut Motility?

We've all heard stress slows down movement. When your brain sends off the signal for a stressor, your motility becomes 30-45% slower. yoga nidra. breathwork. meditation, can all help with this.

Now you've got 5 patterns on the WHY behind constipation, and a few HOW's to support your body,

Here are the five patterns behind constipation:

- 60-90% of people with "IBS" actually have a methane dominant microbial overgrowth. this makes motility 59% slower.
- Low stomach acid is actually a leading cause of slow motility.
- A damaged gut lining in some people can lead to slower motility, because there is damage to receptors and nerves which should normally stimulate movement.
- What if you've been using coffee for motility? But it's just stopped working?
- We've all heard stress slows down movement. When your brain sends off the signal for a stressor, your motility becomes 30-45% slower.

If you don't know where to start. Or don't even know which issues may be part of your puzzle, understanding your [gut motility](https://gutfix.ai/blog/how-can-i-improve-my-gut-motility) is a good place to begin, alongside looking at your [stomach acid](https://gutfix.ai/blog/how-to-improve-digestion-start-with-stomach-acid) levels.

## Frequently asked questions

### What percentage of IBS cases involve methane dominant overgrowth?

60-90% of people with "IBS" actually have a methane dominant microbial overgrowth. this makes motility 59% slower.

### How does low stomach acid cause constipation?

If there isn't enough acid when entering the small intestine secretin, which controls movement, is not triggered. On top of this bile isn't triggered to be released meaning even slower motility.

### Can a damaged gut lining slow down motility?

A damaged gut lining in some people can lead to slower motility, because there is damage to receptors and nerves which should normally stimulate movement, Less of these cells = food sits and ferments longer.

### Why does coffee stop working for constipation over time?

Turns out your body can actually become desensitised to not just coffee, but it's own motility transmitters. When you drink coffee it stimulates massive waves of these hormones/transmitters, eventually your body relies on it and stops producing its own.

### How much can stress slow down gut motility?

When your brain sends off the signal for a stressor, your motility becomes 30-45% slower.

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GutFix is an educational gut-health system, not medical advice, and never a reason to change anything a clinician has prescribed.

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