Histamine & Gut Health
- Jun 3, 2025
- 3 min read
If you're dealing with symptoms like bloating, skin issues, anxiety, or irregular periods and suspect histamine might be involved, gut health is one of the first places to look.
Most people think of histamine as a food intolerance or allergy issue, but it’s also deeply tied to what’s happening inside your digestive system. A disrupted gut barrier, bacteria balance, or infections can increase histamine levels, block your ability to break it down, and set off a cascade that affects your immune system and hormones.
A compromised gut lining activates histamine
When your gut barrier is damaged (often called leaky gut), your immune system detects it as a threat. Histamine is released in the tissue just under your gut lining (called the lamina propria) to try to manage the mess. The more chronic the damage, the more histamine your body keeps producing.
Inflammation lowers your DAO enzyme
DAO is the enzyme that breaks down histamine in your gut. It’s produced in the areas of teh gut lining that become flattened by inflammation. Less surface area means less DAO, and less DAO means more histamine circulating through your system.
Gut bacteria can make histamine too
If you’ve got dysbiosis (imbalanced gut flora), you may be hosting bacteria that produce histamine. That adds to your load, even if you’re eating a low-histamine diet. It’s an internal source most people don’t know about.
Nutrient absorption takes a hit
You also need nutrients to make DAO and support your gut lining. When inflammation is high, absorption drops. So even if you’re eating well, your body may not be getting what it needs to keep up.
Hormones don’t stand a chance
Estrogen, progesterone, and cortisol are all impacted by histamine. For many women, this shows up as anxiety before your period, heavy or irregular cycles, insomnia, and fatigue. When histamine builds up, hormone balance gets harder to maintain.
Good news: You can break the cycle.
Functional stool testing like GI-MAP or Gut Zoomer can help identify the root issues behind your histamine symptoms, including leaky gut, bacterial overgrowth, low secretory IgA, and inflammation markers.
🎁 Get the Free Hormone & Histamine Guide
To dig even deeper, I created a free guide to help you connect the dots between histamine and hormones, with practical advice on how to calm the histamine reactions.
If you've been chasing symptoms that don't have a clear explanation, histamine reactivity is worth ruling out. The quiz takes about two minutes and tells you whether it's likely part of your picture. Take the quiz →
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Jennifer Scanlon, MS, FDN-P, holds a Master of Science in Holistic Nutrition and a Bachelor of Health in Cardiopulmonary and Diagnostic Sciences. Before starting her nutrition practice, she spent more than a decade as a respiratory therapist working alongside physicians and nurses as part of the critical care team. Her role included neonatal resuscitation, ventilator management, blood gas analysis, and the assessment of critically ill patients, providing a strong foundation in physiology and clinical reasoning.
After facing her own health challenges that weren't fully explained by conventional testing, Jennifer returned to graduate school, completing her master's capstone on Hashimoto's disease and the gut-thyroid connection. She has since pursued advanced training in functional health assessment and spent years studying thyroid disorders, gut health, iron deficiency, histamine intolerance, MCAS, and the complex interactions between body systems.
Today, Jennifer helps women uncover potential contributors to symptoms that often fall through the cracks of standard evaluations. Her approach combines nutrition, lifestyle factors, functional testing, and conventional lab data to identify patterns and connect the dots between thyroid, gut, histamine, and hormone issues, helping women make sense of symptoms that are often dismissed when standard lab work comes back "normal." Visit the website here.
Disclaimer: I do not diagnose, treat, prevent, or cure any disease or condition. Nothing I share with my clients is intended to substitute for the advice, treatment or diagnosis of a qualified licensed physician. I may not make any medical diagnoses or claim, nor substitute for your personal physician’s care. It is my role to partner with you to provide ongoing support and accountability in an opt-in model of self-care and any changes should be done under the supervision of a licensed physician.
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