Can Gut Dysbiosis Cause Heartburn?
Yes — there’s a growing understanding that gut dysbiosis, or an imbalance in gut bacteria, may contribute to heartburn and acid reflux symptoms.
Understanding the Connection Between Gut Health and Heartburn
When the balance of bacteria in your digestive system is disrupted, it can affect more than just your stomach — it can influence how your entire digestive tract functions. Here’s how gut dysbiosis may play a role in causing or worsening heartburn:
1. Inflammation and a Weakened LES
Gut dysbiosis can trigger inflammation in the digestive tract. This inflammation may weaken the lower esophageal sphincter (LES) — the muscle that normally keeps stomach contents from flowing back up into the esophagus. When the LES weakens, acid reflux and heartburn become more likely.
2. Impaired Digestion and Slower Motility
An imbalanced gut microbiome can affect the body’s normal digestive rhythm, slowing down gastric emptying and impairing gut motility. When food stays in the stomach longer, pressure can build up, increasing the chances of reflux.
3. SIBO and Increased Abdominal Pressure
Gut dysbiosis can sometimes lead to Small Intestinal Bacterial Overgrowth (SIBO) — a condition where bacteria multiply excessively in the small intestine. This overgrowth can create gas and bloating, which increases abdominal pressure. That pressure can push against the LES, causing it to relax at the wrong times and allowing stomach acid to flow backward into the esophagus.
4. Reduced Stomach Acid and Altered Defenses
Many people with heartburn use acid-reducing medications such as proton pump inhibitors (PPIs). While these can relieve symptoms, long-term use may disrupt the natural balance of the gut microbiome. This can make the gut more vulnerable to dysbiosis and, over time, potentially worsen reflux-related problems.
The Bottom Line
Gut dysbiosis can create a domino effect — weakening the LES, slowing digestion, causing gas and bloating, and ultimately contributing to heartburn symptoms. Supporting your gut health through balanced nutrition, probiotic-rich foods, and lifestyle changes may help improve both your digestion and your reflux symptoms.
Best of Health,
Dr. Lyday
