After age 30 my stomach started to become more sensitive. Prior to this time, I could eat whatever I wanted (reasonable amounts!) without experiencing any discomfort. But eventually my stomach started to protest when it was offended by what I ate. Oftentimes I wouldn’t feel sick until the next day when I would wake up in the morning. I would have the dreaded aura, which is like waves going through my vision. Then the next step was a migraine and nausea. It wasn’t until years later that I learned that it was a result of reflux that I didn’t even realize I was experiencing.
Once I figured out some triggers like over-eating, very spicy food, and saucy food, I avoided them and managed to keep myself in good health. However, I did have the rosacea appear around the same time. I still ate sweets, dairy and gluten regularly but in moderation. I thought I had a relatively healthy diet since I also ate fruits and vegetables. I never thought that my eating habits had anything to do with rosacea, but nobody gave me a reason to believe there was a connection to gut health and skin either.
Gut Health and Rosacea
You’ve tried every topical cream, antibiotic, avoided known triggers, and followed dermatologist recommendations, yet your rosacea continues to flare up seemingly out of nowhere. What if I told you the root cause might not be on your face at all, but rather within your digestive system?
We often treat rosacea as a skin-deep problem. If you are like me and have spent hundreds of dollars on skincare solutions that don’t work, then maybe it’s time to focus on your stomach. A condition called leaky gut might be quietly contributing to the inflammation that shows up on your face. It sounds a little wild, but the gut-skin connection is backed by growing research, and once you understand it, things start to make a lot more sense.
What is Leaky Gut?
Leaky gut syndrome, medically known as increased intestinal permeability, occurs when the lining of your small intestine becomes damaged and allows undigested food particles, toxic waste products, and bacteria to “leak” through the intestinal wall into your bloodstream. Think of your intestinal lining as a carefully controlled security gate that normally allows only properly digested nutrients to pass through while keeping harmful substances out.
Under normal circumstances, the cells lining your intestinal wall are tightly joined together, creating an effective barrier. However, various factors can cause these tight junctions to loosen, creating gaps that allow unwanted substances to slip through. When these foreign particles enter your bloodstream, your immune system goes into high alert, treating them as invaders and launching an inflammatory response to protect your body.
This inflammation doesn’t stay localized to your digestive system. Instead, it can trigger systemic inflammation throughout your body, potentially affecting your skin, joints, brain, and other organs. The result is a state of chronic low-grade inflammation that can manifest in numerous ways, including skin conditions like rosacea.
The development of leaky gut can be gradual and subtle, often going unnoticed for years like it did for me, while slowly contributing to your health issues. Many people don’t realize they have compromised intestinal permeability until symptoms appear in seemingly unrelated areas of their body.
Symptoms of Leaky Gut
The tricky thing about leaky gut is that it doesn’t always cause obvious digestive symptoms. In fact, many people like myself live with it for years without realizing it. Instead, it may show up in more unexpected ways.
Here are some common symptoms that could be tied to leaky gut:
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Bloating or gas after eating
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Food sensitivities or intolerances
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Fatigue, especially after meals
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Brain fog or difficulty concentrating
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Joint pain or muscle aches
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Skin issues like eczema, acne, or rosacea
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Headaches or migraines
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Anxiety or mood swings
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Frequent colds or infections (due to compromised immunity)
Because these symptoms are so varied, it’s easy to overlook the gut as the root cause. You might see a dermatologist for rosacea, a neurologist for migraines, or a rheumatologist for joint pain without ever connecting the dots back to your digestive health.
Can Leaky Gut Be Silent?
One of the most surprising things about leaky gut is how stealthy it can be.
You might expect that a gut issue would come with obvious symptoms like bloating, stomach cramps, or frequent trips to the bathroom. But many people with leaky gut don’t experience any digestive discomfort at all. In fact, their gut may feel fine.
That’s because the effects of leaky gut often show up far from the digestive system. When the gut lining becomes permeable, it can trigger a wide range of systemic symptoms, from skin problems to brain fog to fatigue. And since these issues don’t always feel “gastrointestinal,” they’re easy to misdiagnose or brush off as unrelated.
Think of it like a slow leak in a tire. You may not notice it right away, but over time, things start to feel off. Maybe your energy drops. Maybe your skin becomes more reactive. Maybe you catch colds more often. These are all signs that your immune system is on high alert, possibly due to a leaky gut.
In fact, many people only discover they may have leaky gut after developing a seemingly unrelated condition—like rosacea! By the time skin inflammation shows up, the gut barrier may have been compromised for months or even years. That’s why it’s so important to consider the gut when dealing with chronic or mysterious health issues, especially if they’re inflammatory in nature.
If you’ve been trying to treat rosacea with creams, antibiotics, or laser treatments and nothing seems to work long-term, it’s worth asking whether the root cause might be deeper than you think.
Long-Term Consequences of Leaky Gut
I’m working on repairing my gut health. The last straw (other than a major rosacea and perioral dermatitis flare) was when I started to experience vertigo. Vertigo has to be one of the worst experiences of my life and I live in fear of it to be honest. Another experience I had recently was when I strayed from my diet (damn you McDonald’s french fries!). Only a few hours after eating the fries my ears plugged up and I felt congested. The next morning I woke up with tinnitus in one ear.
I searched on the internet like crazy and read some scary stuff like tinnitus lasting for a very long time for some people. Then I searched specifically for how the gut is related to tinnitus and realized it was GERD or reflux that caused it. A few stomach medications later it was gone by the next morning.
Here are some other long-term consequences of not address leaky gut:
1. Chronic Inflammation
When the gut barrier is compromised, substances like toxins, bacteria, and undigested food particles can “leak” into the bloodstream. This sets off an immune response that can lead to low-grade, ongoing inflammation throughout the body. Over time, this inflammation can contribute to a wide range of chronic health problems.
2. Autoimmune Diseases
Autoimmune disorders are when the immune system starts attacking the body’s own tissues. These conditions include:
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Hashimoto’s thyroiditis (autoimmune thyroid disease)
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Rheumatoid arthritis
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Type 1 diabetes
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Celiac disease
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Lupus
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Multiple sclerosis
The theory is that leaky gut leads to something called “molecular mimicry,” where the immune system mistakes the body’s own tissues for foreign invaders due to the presence of leaked antigens.
3. Food Sensitivities and Intolerances
As the gut becomes more permeable, the immune system is exposed to larger, undigested food particles, especially proteins like gluten or casein. This can trigger the development of new food sensitivities, making it harder to tolerate foods that once were fine. This can worsen inflammation and further damage the gut lining in a vicious cycle.
4. Mood Disorders and Cognitive Issues
Leaky gut is closely tied to the gut-brain axis, the communication network between your digestive system and your brain. When the gut barrier is compromised, it can affect brain chemistry and increase risk for:
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Anxiety
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Depression
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Brain fog
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Poor memory and focus
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Insomnia
Some studies even link leaky gut and gut dysbiosis to neurodegenerative conditions like Parkinson’s and Alzheimer’s, though research is still evolving.
5. Skin Conditions (Beyond Rosacea)
Rosacea is just one of many skin conditions potentially tied to gut health. Leaky gut has also been associated with:
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Eczema
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Psoriasis
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Acne
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Hives or chronic rashes
These skin issues are often inflammatory in nature and can flare in response to food sensitivities or immune system dysfunction caused by a leaky gut.
6. Weakened Immune System
Because over 70% of the immune system resides in the gut, a leaky gut compromises your body’s ability to respond appropriately to threats. This can result in:
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Frequent colds or infections
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Delayed recovery from illness
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Overactive immune responses to harmless substances (allergies, asthma)
7. Nutrient Deficiencies
Damage to the gut lining can impair nutrient absorption, leading to long-term deficiencies in vitamins and minerals like:
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Iron
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Zinc
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Magnesium
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B vitamins (especially B12)
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Vitamin D
This can lead to fatigue, muscle weakness, anemia, poor wound healing, and hair loss.
8. Metabolic and Hormonal Issues
A leaky gut can also disrupt metabolic health and contribute to:
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Weight gain or difficulty losing weight
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Blood sugar instability
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Insulin resistance
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Hormonal imbalances (especially estrogen and cortisol dysregulation)
In women, this may manifest as PMS, irregular cycles, or worsening symptoms of conditions like PCOS or endometriosis.
Testing for Leaky Gut
Yes, there are tests for leaky gut, though it’s important to know that they vary in accuracy and availability, and not all conventional doctors routinely use or recommend them. Functional and integrative medicine practitioners are more likely to offer these tests if they suspect increased intestinal permeability.
Here are the main types of tests used to assess leaky gut:
1. Lactulose/Mannitol Test (Intestinal Permeability Test)
This is the most direct and widely used test for diagnosing leaky gut.
How it works:
You drink a solution containing two sugar molecules, lactulose (a larger molecule) and mannitol (a smaller one). These sugars are absorbed through the intestinal lining and later measured in your urine.
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Mannitol is small enough to pass through a healthy gut wall, so it should show up in the urine.
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Lactulose is too large to pass through a normal, healthy gut lining. If it shows up in your urine in high amounts, it suggests increased intestinal permeability.
What it tells you:
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A high lactulose/mannitol ratio = potential leaky gut.
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A low absorption of both sugars may suggest malabsorption or other gut issues.
2. Zonulin Test
Zonulin is a protein that helps regulate the tight junctions in your intestinal wall. When zonulin levels are elevated, those tight junctions can loosen—leading to increased permeability.
How it works:
A blood or stool sample is taken to measure zonulin levels.
What it tells you:
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Elevated zonulin = a marker for increased intestinal permeability.
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However, zonulin can be elevated for reasons other than leaky gut, so it’s best interpreted in the context of symptoms and other test results.
3. Comprehensive Stool Analysis
While not specifically a test for leaky gut, a functional stool test can provide a broader picture of gut health that might suggest leaky gut is present.
These tests can check for:
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Inflammatory markers (e.g., calprotectin, secretory IgA)
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Pathogenic bacteria, yeast, or parasites
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Digestive enzyme output
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Beneficial vs. harmful microbiota balance
If there’s gut dysbiosis, chronic inflammation, or infection, it increases the likelihood that the gut lining is compromised.
4. Antibody Testing (IgG, IgA, IgM)
Some functional medicine panels include blood tests for antibodies that react to components of the gut lining:
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Anti-lipopolysaccharide (LPS) antibodies: LPS is a component of bacterial cell walls. If these are leaking into the bloodstream, it’s a red flag.
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Anti-occludin or anti-zonulin antibodies: Suggests your immune system is reacting to these gut barrier proteins—another sign of leaky gut.
These tests aren’t used in mainstream medicine yet, but they are gaining traction in integrative practices.
5. Food Sensitivity Panels (IgG Testing)
Again, not a diagnostic tool for leaky gut per se, but if a person has multiple food sensitivities, especially to seemingly unrelated foods, it may suggest that the gut lining is compromised and allowing large food proteins into the bloodstream.
You don’t always need these tests. Just trying something like an elimination diet alone can address leaky gut. It’s worth trying even if you don’t suspect your diet is an issue. I’m so glad I did!