By Dr. Paul Deglmann
Edited by Meghan Feir Walker
For decades, the belief that “stress causes ulcers” has circulated in both medical conversations and everyday life. But when we look more closely at digestive physiology, the story becomes more nuanced.
Can stress cause stomach ulcers? Stress alone rarely creates ulcers directly. However, it can significantly weaken the stomach’s natural defenses and make the digestive tract more vulnerable to irritation over time.
After more than two decades of working with patients struggling with digestive issues, one thing has become very clear: Digestive symptoms rarely have a single cause. In functional medicine, we take a “Test, don’t guess” approach because symptoms like ulcers often develop when several underlying factors combine.
Stress can certainly be part of the picture, but it is rarely the entire story.
What Causes Ulcers in the Stomach?
Stomach ulcers develop when the stomach’s protective lining becomes compromised, allowing stomach acid or bile to irritate the underlying tissue.
Several factors commonly contribute to this process, including:
- H. pylori bacterial overgrowth
- Long-term use of medications such as NSAIDs
- Bile reflux
- Chronic gut inflammation
- Imbalances in the gut microbiome
The stomach normally produces a thick layer of mucus that protects the lining from harsh digestive acids. When that protective barrier weakens, irritation and tissue damage can occur.
From a functional medicine perspective, identifying why that barrier has weakened is essential. This is where advanced testing becomes incredibly valuable.
Instead of guessing, we often use functional testing such as:
- Comprehensive stool testing to identify H. pylori, microbial imbalances, and inflammatory markers
- Food sensitivity testing to uncover immune reactions that may inflame the gut lining
- Organic acid testing to evaluate microbial activity and metabolic stress
- Micronutrient testing to detect nutrient deficiencies that impair tissue repair
- Adrenal and cortisol testing to understand how chronic stress is affecting the body
This “Test, don’t guess” approach allows us to identify the true root causes behind digestive symptoms rather than simply treating the surface-level discomfort.
Can Stress Contribute to Ulcer Development?
While stress alone does not usually create ulcers, it can absolutely make the stomach more vulnerable to irritation.
Chronic stress can:
- Reduce blood flow to the digestive tract
- Decrease protective mucus production
- Increase sensitivity to stomach acid
- Slow tissue repair and healing
Over time, these changes can weaken the stomach lining and make it easier for irritants such as acid, bile, or bacterial imbalances to cause damage.
This is why people often notice digestive symptoms worsening during periods of prolonged stress.
Nervous System and Digestion
The digestive system is deeply connected to the nervous system.
When the body is under stress, it shifts into fight-or-flight mode, which diverts resources away from digestion. Blood flow decreases to the stomach and intestines while stress hormones rise.
This shift can:
- Slow digestion
- Alter stomach acid production
- Reduce the stomach’s protective lining
- Interfere with gut repair processes
When this stress response becomes chronic, the stomach lining may become more vulnerable to irritants that otherwise would not cause damage.
Stress Ulcers vs. Peptic Ulcers
Understanding the difference between stress ulcers and peptic ulcers is also important. Stress ulcers typically occur during severe physical stress, such as:
- Major surgery
- Trauma
- Serious illness
- Severe emotional stress
These ulcers often develop quickly due to reduced blood flow and physiological shock.
Peptic ulcers, however, are far more common and are usually associated with long-term digestive factors such as H. pylori infections, medication use, chronic inflammation, and gut imbalances.
Understanding the difference is important because identifying the underlying cause helps guide the most appropriate treatment strategy.
Symptoms of Stress-Related Stomach Ulcers
When the stomach lining becomes irritated, symptoms may include:
- Burning or aching in the upper abdomen
- Bloating or nausea
- Reduced appetite
- Digestive discomfort that worsens during stressful periods
These symptoms can fluctuate and may sometimes resemble other digestive conditions such as acid reflux or bile reflux. This is another reason why proper testing can be helpful when symptoms persist.
How to Support Your Gut When Under Stress
Functional medicine focuses on strengthening the digestive system and improving resilience rather than simply suppressing symptoms.
This often includes strategies that support the stomach lining, digestive motility, and nervous system balance. If you're looking for a broader reset, you may benefit from learning how to reset your gut.
Gentle Dietary Choices
During periods of stress, certain foods may help reduce irritation to the stomach lining.
Many people benefit from foods such as:
- Warm soups and broth-based meals
- Cooked vegetables
- Easily digested proteins
- Soft, simple meals
At the same time, temporarily reducing certain foods may help calm stomach irritation, including:
- Alcohol
- Excess caffeine
- Fried foods
- Spicy foods
- Citrus fruits
- Excessive sugar
A structured plan, such as a Gut Healing Diet, can often support digestive recovery while the gut lining repairs.
Lifestyle Practices for Gut Repair
Lifestyle habits play a powerful role in digestive health.
Helpful practices include:
- Prioritizing consistent sleep
- Practicing deep breathing or relaxation techniques
- Walking after meals
- Avoiding late-night eating
- Slowing down and chewing thoroughly during meals
These habits help shift the nervous system into a rest-and-digest state, allowing the digestive tract to function and heal more effectively.
When to Consider Deeper Gut Health Support
If symptoms continue or frequently flare up during stressful periods, it may indicate deeper digestive imbalances.
This is where functional testing can provide valuable insight. Testing can reveal important factors such as microbiome imbalances, inflammation markers, digestive function, and nutrient deficiencies.
If you’re interested in exploring this further, you can learn more about testing gut health or visit our gut health page for additional resources.
Functional medicine looks at the whole picture—stress, diet, microbiome balance, gut lining health, and daily habits—to build lasting digestive resilience.
Are you ready to improve your gut health? Schedule your free 15-minute consultation with Dr. Paul’s team to explore a personalized, functional approach for a helpful and effective path to recovery.
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