Heartburn seems simple… your chest burns, you grab an antacid, and move on with your life. Easy fix, right? Not exactly. What if that burning sensation isn’t always caused by too much stomach acid… but sometimes by too little?

That idea sounds backwards, but science—and a little history—suggests it’s not as crazy as it sounds.

Let’s break it down.

1. Your Stomach Is Supposed to Be Extremely Acidic (And That’s a Good Thing)
Your stomach isn’t meant to be neutral—it’s meant to be a high-acid powerhouse. Normal stomach pH ranges from 1.5 to 3.5. That’s strong enough to break down protein, kill harmful bacteria, and activate digestive enzymes.

When stomach acid drops (a condition called hypochlorhydria), digestion becomes inefficient. Proteins don’t break down properly, food lingers longer, and fermentation can begin—hello gas, bloating, and yes… heartburn.

In fact, research suggests that low stomach acid becomes more common with age. Some estimates show that up to 30% of people over 60 may have reduced gastric acid production.

So the question becomes… are we always treating the right problem?

2. Betaine Hydrochloride Was Once a Mainstream Solution
Before modern antacids took over, doctors in the early 20th century often used betaine hydrochloride to increase stomach acid in certain patients.

A 1999 study published in The Journal of Clinical Pharmacology found that betaine HCl could significantly lower gastric pH (making it more acidic) within about 30 minutes in individuals with low stomach acid.

Why does that matter? Because proper acidity activates pepsin, the enzyme responsible for breaking down protein. Without enough acid, pepsin just sits there like a couch potato.

Translation: You can eat all the healthy protein you want, but if your stomach acid is low, your body may struggle to actually use it.

3. Antacids May Relieve Symptoms… But They Don’t Always Fix the Cause
Modern heartburn treatments—like proton pump inhibitors (PPIs)—are designed to reduce stomach acid. And they do that very effectively.

In fact, PPIs can reduce stomach acid production by up to 90%.

That sounds impressive… until you realize your body actually needs acid to function properly.

Long-term use of acid-suppressing medications has been associated in studies with nutrient deficiencies (like vitamin B12, magnesium, and calcium), increased risk of certain infections, and changes in gut microbiome balance.

To be clear, these medications have their place—especially in severe cases—but they may not always address why the symptoms started.

4. Low Acid Can Create Pressure That Feels Like “Too Much Acid”
Here’s where things get interesting.

When stomach acid is too low, food doesn’t break down efficiently. It sits longer in the stomach and can begin to ferment, producing gas.

That gas creates pressure. And pressure pushes stomach contents—including acid—up toward the esophagus.

So even though acid is involved in the burning sensation, the root issue may actually be poor digestion and delayed stomach emptying.

It’s not just about acid levels… it’s about timing, movement, and balance.

5. Your Lower Esophageal Sphincter (LES) Needs Acid to Work Properly
The LES is the valve between your stomach and esophagus. Its job is simple: open when you swallow, close the rest of the time.

Research suggests that adequate stomach acidity helps signal this valve to stay tightly closed. When acid levels are too low, that signal may weaken, making reflux more likely.

In other words, low acid doesn’t just affect digestion—it may also affect the mechanics of reflux itself.

6. Stress Is a Silent Acid Killer
If you’ve ever had digestive issues during a stressful time, you’re not imagining it.

Stress activates the sympathetic nervous system—your “fight or flight” mode—which diverts energy away from digestion. This can reduce stomach acid production and slow digestive processes.

Studies have shown that psychological stress can significantly impair gastric secretion and motility.

So that rushed meal, eaten while scrolling your phone or worrying about life? Your stomach notices… and it may respond by dialing down acid production.

7. The Real Goal Isn’t Less Acid—It’s Better Digestion
The conversation around heartburn often gets reduced to one thing: acid = bad.

But the truth is more nuanced.

Healthy digestion depends on a delicate balance of acid, enzymes, muscle function, and timing. When that system is working properly, food breaks down efficiently, nutrients are absorbed, and pressure doesn’t build where it shouldn’t.

That’s the real goal—not just putting out the fire, but understanding why the fire started in the first place.

Closing Thoughts

Heartburn isn’t always as straightforward as it feels. Sometimes the burn is a signal—not of excess, but of imbalance. And while modern solutions can provide relief, understanding the underlying mechanics of digestion opens the door to smarter, more personalized choices.

Your body isn’t trying to work against you—it’s trying to communicate. The more you understand what it’s saying, the better you can support it.

If you love learning the “why” behind how your body works and want more science-backed, real-life wellness insights, visit mindbodyspiritlife.com often. Let’s inspire one another.