Why Heartburn Keeps Coming Back (And How to Finally Fix It)

If you’ve ever felt that burning sensation rising into your chest after a meal, you’re not alone.

Heartburn affects more than 60 million Americans every month, and millions rely on antacids or acid-blocking medications just to get through the day.

Most people are told the same thing: you have too much stomach acid, so the solution seems obvious: Block it.

But here’s what surprises many people. In many cases, heartburn isn’t caused by too much stomach acid at all. Often it’s the opposite.

Over the years working with patients in my clinics, heartburn was one of the most common digestive complaints I saw. And again and again, people were shocked to learn that their symptoms were often connected to too little stomach acid and poor digestion, not too much.

Once you understand why that happens, heartburn starts to make a lot more sense, and in many cases becomes much easier to improve.

What’s Actually Happening When You Feel Heartburn

Heartburn occurs when stomach contents move backward into the esophagus, the tube that connects your mouth to your stomach.

Your stomach is designed to handle acid. Your esophagus is not. So when stomach acid splashes upward, it causes that familiar burning sensation in the chest or throat.

Normally, a small muscular valve called the lower esophageal sphincter (LES) keeps stomach contents where they belong. When this valve weakens or relaxes at the wrong time, reflux can occur.

But here’s where the misunderstanding begins. Many people assume reflux happens because the stomach is producing too much acid. In reality, reflux is often driven by pressure building inside the stomach, and pressure is what pushes stomach contents upward through the valve.

Why Low Stomach Acid Can Contribute to Heartburn

Stomach acid plays a critical role in digestion. It helps break down protein, activates digestive enzymes, and acts as one of the body’s first lines of defense against harmful microbes that enter through food.

When stomach acid levels are too low, food doesn’t break down efficiently. Instead of moving smoothly through digestion, food can sit in the stomach longer than it should.

That delayed digestion can lead to fermentation, gas, and pressure. And pressure in the stomach is what forces stomach contents upward into the esophagus.

So the burning sensation people assume is caused by “too much acid” can actually occur because digestion isn’t strong enough to move food along efficiently.

The Problem With Relying Only on Acid Blockers

Antacids and proton pump inhibitors (PPIs) are among the most commonly used medications for heartburn. Antacids work by neutralizing stomach acid. PPIs go even further by shutting down acid production almost completely.

While these medications can provide symptom relief, they don’t address the underlying reason reflux is happening.

And stomach acid isn’t something the body produces by accident. It’s essential for breaking down protein, absorbing nutrients like vitamin B12, calcium, and magnesium, and protecting the digestive tract from harmful bacteria.

Long-term use of acid-blocking medications has also been linked in research to increased risks of nutrient deficiencies, bone fractures, and infections such as pneumonia.

Another challenge is something called acid rebound. When people stop PPIs after long-term use, the stomach may temporarily produce even more acid, making symptoms feel worse.

If you’re currently using acid blockers, it’s important not to stop suddenly. Gradually tapering with guidance can help reduce rebound symptoms. I’ve included a link to my Acid Blocker Recovery Guide here if you’d like help with that process.

How to Find Out If You Have Low Stomach Acid

One of the most accurate ways to measure stomach acid production is called the Heidelberg test. This test uses a small capsule to measure stomach acidity during digestion and can help determine whether acid levels are normal, too high, or too low.

Not every medical practice offers the Heidelberg test, but some integrative or functional medicine clinics do. If you’re curious about your stomach acid levels, it’s worth asking your healthcare provider.

5 Habits You Can Start Today to Reduce Heartburn

If you’re serious about getting to the root of heartburn instead of relying on pills meal after meal, year after year, start with a few habits that support digestion and reduce pressure in the stomach.

These changes are simple, but they can make a meaningful difference.

1. Eat smaller meals and slow down. If you’ve ever finished a big meal and immediately felt pressure in your chest or throat, that’s a sign the stomach is under too much pressure. Large meals stretch the stomach and increase pressure against the esophageal valve. Eating quickly makes this worse because your brain needs about 20 minutes to register fullness. Slowing down helps prevent overeating before your body has time to signal that it’s satisfied. Learn more about how to control your hunger here.
2. Stay upright after eating. This is one of the most important habits for preventing reflux. Lying down soon after eating allows stomach contents to move upward more easily. Give digestion 2-3 hours before lying down. If your schedule tends to involve eating late and heading straight to the couch or bed, it may be worth adjusting your routine.
3. Move after meals. A short walk after dinner can help digestion and reduce pressure in the stomach. Even light movement like walking around the house or gently moving instead of sitting immediately can help food move along.
4. Sleep on your left side. If nighttime reflux is a problem, sleeping on the left side may help reduce acid exposure because of the way the stomach sits below the esophagus in that position.
5. Pay attention to trigger foods.
   Certain foods relax the esophageal valve in some people. Common triggers include caffeine, chocolate, alcohol, and spicy foods. Tracking symptoms alongside meals can help you identify your personal triggers.

Give these changes some time and pay attention to how your body responds. Many people begin to notice improvements when they consistently support digestion instead of working against it.

Supporting Digestion Naturally

In addition to lifestyle changes, some people benefit from supporting digestion directly.

Digestive enzymes can help break down food more efficiently so it doesn’t linger in the stomach and create pressure. When food is digested properly, there’s less chance for fermentation, gas, and reflux.

Another option often used in gut repair protocols is L-glutamine, an amino acid that supports the health of the gut lining.

These tools aren’t quick fixes, but they can help support the digestive system while you work on the habits that improve reflux long term.

The Bottom Line

Heartburn is often treated as a problem of too much stomach acid. But for many people, the real issue is poor digestion and pressure building in the stomach.

Understanding that difference can change how you approach the problem and help you move toward solutions that support your digestive system instead of simply shutting it down.

If you’d like more practical strategies for improving digestion and gut health naturally, you can also subscribe to my newsletter where I share tips each month.