You know that burning feeling after you eat, or the lump in your throat that just won’t go away, or reflux that somehow gets worse the second you lie down?
Most people are told one of two things:
“You have too much stomach acid.”
“Or you don’t have enough.”
Two completely opposite explanations, and neither one encompasses the why reflux is actually happening. I can’t tell you how many clients come to us after trying both PPIs to lower stomach acid and betaine HCL to increase stomach acid. They’ve taken antacids, maybe even been on medications for years, when in reality they are meant to be a 6-8 week course. Then they might switch directions and start taking betaine HCl, thinking low stomach acid is the root cause, and still not feel the relief they are looking for.
So naturally, the question becomes, does low stomach acid cause reflux? The answer is sometimes, but most of the time it is not the full story. And if you have been stuck in that cycle, there is usually something else happening that no one has explained to you yet.
Reflux Isn’t Just an Acid Problem, It’s a Lid Problem
A few weeks ago, I was explaining reflux to a client and used the simplest analogy I could think of. Imagine your stomach like a mason jar. Inside the jar is stomach acid. That part is normal and you want acid there. Stomach acid helps you break down food, absorb nutrients, and protect against bacteria.
Now imagine the lid on the top of that jar. That lid is your lower esophageal sphincter, or LES. Its job is simple. It opens to let food in and closes to keep everything where it belongs. Reflux often happens when that lid is not sealing properly.
So instead of contents staying in the stomach, they start moving upward, which is what creates that burning, regurgitation, or throat irritation common with reflux. Due to LES function, reflux is often not just an “acid problem”. It is often also a containment problem. We need to make sure that your stomach acid is where it belongs (in the stomach) and doing what it is designed to do (assisting in food breakdown).
Where Low Stomach Acid Actually Fits In
Low stomach acid is real, and we see it all the time in practice. It can show up as bloating, gas, feeling overly full after meals (especially 1-2 hours), or that heavy feeling like food just sits in your stomach. It can also contribute to things like SIBO or candida over time due to poor food breakdown.
While stomach acid is essential for digestion and often a missing piece of bloating, it doesn’t always mean that low stomach acid is the reason for your reflux. Reflux often happens after acid is produced, and not only because of how much is there.
A simple way to think about it is this: Low stomach acid is like having a weak flame on your stove. Your food is not breaking down well, and everything feels slow. Reflux is like food boiling over because the lid is not on correctly. Those are two completely different problems. And if something is already boiling over, turning up the flame does not fix it. It usually makes it worse.
Why Supporting Stomach Acid Can Make Reflux Worse
Its really common to hear that low stomach acid is the root cause of reflux, so they start trying to fix it with Betaine HCL, digestive bitters or other digestive supports. But, instead of feeling better they start noticing pain, irritation and feel confused. They start wondering if maybe they do have high stomach acid instead?
Here is what is usually happening underneath the surface.
Reflux is often driven by pressure, not just acid
If reflux is coming from bloating, slow motility, or a weak lower esophageal sphincter, adding more acid does not address the real pressure issue. The problem is not what is in the stomach; it is that the LES is not functioning correctly, allowing food contents to move upward. Without fixing that, symptoms tend to persist or worsen.
More acid can increase irritation
When the “lid” is not sealing properly, anything in the stomach can come up into the esophagus. If you increase stomach acid in that situation, you are increasing the intensity of what is coming up. That often leads to more burning, more throat irritation, and more discomfort (especially with something as potent as betaine HCL).
It is like adding to an already overflowing cup
If something is already spilling over, adding more liquid does not prevent the cup from spilling, it just increases the amount of water that is spilling over. Similarly, the same thing happens with reflux when acid is added without addressing pressure or movement.
Stomach acid support is a tool, not the first step
Supporting stomach acid can be helpful in the right context, especially when digestion is clearly impaired. But supporting stomach acid works best when you understand what is actually driving your symptoms first. Otherwise, it can keep you stuck instead of moving you forward.
Timing and context matter so much when supporting stomach acid as well as fully understanding what is causing reflux so that you are addressing the full context.
What’s Really Driving Your Reflux
If reflux is not just related to stomach acid, then what is actually causing it? Most of the time, it is a combination of factors working together. Pressure is a big one. Bloating, gas, constipation, large meals, or even tight clothing can increase pressure in the abdomen and push stomach contents upward. I often explain this like sourdough. If you have ever had a sourdough starter and it starts bubbling and expanding, it eventually overflows.
That is what is happening in your stomach when there is too much pressure and not enough containment.
Gut motility and movement is another piece of the puzzle when it comes to reflux. If your stomach is slow to empty, food and acid sit longer, which increases the chance of reflux. The function of the LES matters because if that lid is not closing well, it does not matter how much acid you have ultimately things are going to come up.
Your nervous system and diaphragm also play a role in regulating digestion because stress signals to the body that it is time to “flee” versus digest a meal. If you are eating in a rushed or stressed state, digestion does not coordinate well.
How to Read Your Reflux Symptoms
One of the most helpful shifts you can make is paying attention to when your symptoms happen, not just what they are.
- If your reflux is worse after large meals, that usually points to pressure.
- If it is worse when you lie down, that brings gravity and clearance into the conversation.
- If you feel relief after burping, that suggests gas and distension are involved.
- If you feel constantly bloated or like food just sits in your stomach, that points more toward poor stomach acid production, poor digestion and slow motility.
What Actually Helps Reflux Long Term
Reflux becomes a lot less confusing once you understand all of the pieces of the puzzle and starting with some easy to implement strategies can be the best place to start.
Supporting the LES, supporting gastric emptying, and relieving any pressure related issues are great ways to make sure that the entire digestive system are all working properly from top to bottom.
Support the lid
The first step of the process is supporting the LES “lid”. You can easily support the LES though slowing down at meals, chewing your food well, and taking a few deep breaths before eating. All of these simple tools can help your body shift into a more relaxed, digestive state sot hat your nervous system is “cued” that it is safe to digest. When your nervous system is supported, that “lid” tends to work better.
Reduce pressure
The second step is making sure that excess pressure is not building up and that the bowels and motility are moving in a coordinated way. Pressure can come from bloating, large meals, or constipation building up over time. Supporting regular bowel movements to avoid constipation, becomes increasingly important when dealing with reflux in order to avoid excess pressure building up and causing an upward strain on the stomach and system.
Improve gut movement
Your digestive system is designed to move food through the digestive tract efficiently and you should be clearing your bowels 1-3 times per day. When things slow down, food and acid sit longer, increasing the chance of reflux and excess fermentation. Supporting motility through habits like walking after meals, consistent meal timing, and gentle digestive support can make a big difference.
Why Your Reflux Hasn’t Improved Yet
If you have tried changing your diet, cutting foods, taking supplements, or even medications, and you are still dealing with reflux, it can be helpful to zoom out and see what is possibly impacting the entire digestive system leading to lack of coordination with the digestive tract.
Reflux is rarely just one thing and is usually a combination of pressure, movement, and coordination. Once you start addressing those pieces, you can start to see steady improvements in your reflux symptoms.
Reflux Is More Than Just Stomach Acid
So does low stomach acid cause reflux?
Sometimes, yes. But more often, it is just one piece of a much bigger picture. Reflux is often much more about how your system is handling acid versus just how much acid is there. When you start looking at pressure, movement, and how well your body is coordinating digestion, things start to make a lot more sense and its easier to find a plan that works best for you.
If you are ready to stop guessing and actually understand what is driving your symptoms, you can start with my free Gut Health Quiz or learn more about gutTogether for a more personalized approach.
