Heartburn and acid reflux affect millions of people every day. If you’ve ever felt that burning sensation in your chest or throat after eating, you’ve probably been told the same thing most patients hear: you have too much stomach acid.
But in functional medicine, we see something very different.
In this article, we’ll break down what actually causes heartburn, why common medications often miss the root issue, and how addressing gut health, nervous system function, and inflammation can lead to real, lasting relief.
What Is Heartburn?
Heartburn is a burning sensation that occurs when stomach contents move upward into the esophagus. This is commonly referred to as acid reflux or GERD (gastroesophageal reflux disease).
The burning sensation happens when acidic stomach contents irritate the lining of the esophagus, which is not designed to handle acid exposure.
The Biggest Myth About Heartburn: Too Much Stomach Acid
One of the most common misconceptions is that heartburn is caused by excess stomach acid.
In reality, most people with chronic heartburn actually have low stomach acid, not high.
Here’s why that matters.
The Cardiac Sphincter: The Real Player in Heartburn
Between your esophagus and your stomach is a valve called the lower esophageal sphincter, also known as the cardiac sphincter.
Its job is simple:
- Open to let food into the stomach
- Close to keep stomach contents from coming back up
When this valve loses proper tone and stays partially open, acid can reflux into the esophagus — even if stomach acid levels are low.
Why the Cardiac Sphincter Stops Working Properly
The cardiac sphincter is controlled by the nervous system, specifically the parasympathetic (calming) branch.
When the nervous system is irritated, this valve doesn’t function correctly.
Common causes of this neurological dysfunction include:
- Chronic inflammation
- Gut infections
- Food sensitivities
- Stress and nervous system overload
- Long-term digestive dysfunction
This is why heartburn is better understood as a neurological and inflammatory issue, not simply a chemical one.
Why Antacids and PPIs Miss the Root Cause
Most conventional treatments for heartburn involve:
- Antacids (Tums, baking soda)
- Proton pump inhibitors (Prilosec, Omeprazole, Nexium)
These medications reduce stomach acid, which may temporarily relieve symptoms — but they don’t fix the underlying problem.
Long-term use of acid-reducing medications has been associated with:
- Poor digestion and nutrient absorption
- Increased gut infections
- Bone mineral density loss
- Worsening gut inflammation over time
If low stomach acid is already part of the problem, suppressing it further can actually delay healing.
The Role of Food Sensitivities in Heartburn
One of the most common root causes we see in patients with heartburn is food sensitivity–driven inflammation.
Common trigger foods include:
- Fried foods and seed oils
- Dairy
- Gluten and wheat
- Nightshades (tomatoes, peppers)
- Spicy or heavily processed foods
When these foods trigger an immune response in the gut, inflammation increases, nervous system tone decreases, and the cardiac sphincter loses its ability to stay closed.
Gut Infections and Heartburn
Heartburn isn’t always food-related.
Many patients with chronic reflux also have:
- Bacterial overgrowth
- Fungal overgrowth
- Parasitic infections
- H. pylori involvement
These infections create inflammation and toxic byproducts that stress the gut, liver, and nervous system — all of which can contribute to reflux symptoms.
In these cases, simply avoiding foods or taking acid blockers won’t resolve the issue.
Low Stomach Acid: Why Increasing Acid Sometimes Helps
Once inflammation and infections are addressed, many patients actually need to restore healthy stomach acid levels.
Proper stomach acid is essential for:
- Closing the cardiac sphincter
- Breaking down protein
- Preventing bacterial overgrowth
- Supporting bile flow and digestion
This is why some people experience relief when using:
- Apple cider vinegar (in specific cases)
- Betaine HCl
- Zinc and stomach acid–supporting nutrients
However, increasing acid too early — before calming inflammation — can worsen symptoms. Timing matters.
Hiatal Hernia and Heartburn
A hiatal hernia occurs when the stomach pushes upward into the diaphragm, which can increase reflux symptoms.
In many cases, this is a functional issue rather than a structural one and is influenced by:
- Diaphragm tension
- Nervous system dysfunction
- Gut inflammation
- Chronic digestive stress
When underlying inflammation is addressed, many patients experience significant improvement without surgical intervention.
Practical Steps to Identify Your Heartburn Triggers
If you’re struggling with heartburn, start with these foundational steps:
- Track your symptoms
Keep a food and symptom journal to identify patterns. - Notice timing
Does heartburn happen after certain meals, at night, or when lying down? - Assess gut symptoms
Bloating, gas, and irregular stools often point to gut infections or imbalances. - Reduce inflammatory foods
Temporarily eliminate common triggers and reintroduce strategically. - Support the nervous system
Digestion requires a calm nervous system — stress matters more than most people realize.
Heartburn Is Fixable When You Address the Root Cause
Heartburn isn’t something you’re doomed to manage forever.
When you understand that reflux is driven by nervous system tone, gut health, inflammation, and digestion, everything changes.
Instead of suppressing symptoms, the goal becomes restoring proper function — and when that happens, heartburn often resolves completely.
Want Help Identifying Your Root Cause?
If you’re dealing with chronic heartburn, acid reflux, or GERD and want a functional, root-cause approach, working with a practitioner trained in gut health and nervous system regulation can make all the difference.
Relief is possible — when you stop chasing symptoms and start fixing what’s actually driving them.
If you are considering taking a prescription medication, seek the care and advice of a medical professional. This is my take on nutritional supplements, not medications.
If you are experiencing any health issues and would like to discuss them, book a free consultation with me here. To find other docs that practice how I do, click here. For more health articles, click here.
If you aren’t too short on time, tune into my podcast below to listen more about how to get rid of your heartburn.