Top Leaky Gut Symptoms You Shouldn't Ignore

Top Leaky Gut Symptoms You Shouldn't Ignore

A Functional Health Guide to Understanding — and Healing — Your Gut

If you've been dealing with bloating, brain fog, fatigue, skin issues, or seemingly random food sensitivities — and nobody seems to have a clear answer why — you're not alone. These kinds of symptoms are frustratingly vague, easy to dismiss, and often dismissed by conventional medicine as stress or 'just how you are.'

But from an integrative and functional health perspective, there's often a root cause worth investigating: increased intestinal permeability, more commonly known as leaky gut.

In this article, we're going to break down what leaky gut actually is, the most common symptoms, what causes it, why it matters for your long-term health, and — most importantly — how to start healing.

Every week I hop on calls with clients who are dealing with ongoing chronic health issues that don't ever seem to go away no matter how much they change their diet or what medications they are prescribed. A huge piece of this stems from having a gut that is compromised to where you always have this ongoing inflammation under the radar that is impacting everything.

Everything starts with your gut. Your immune system, your mental health (your neurotransmitters are produced in your gut), nutrient absorption, detox pathways, it all starts with a healthy gut. 

So, What Exactly Is Leaky Gut?

Your gut lining is one of the most sophisticated barriers in the human body. It's only one cell layer thick, and it plays an enormous role in deciding what gets absorbed into your bloodstream and what gets kept out. Think of it like a carefully managed security checkpoint.

When the tight junctions between those cells become compromised — due to chronic stress, poor diet, environmental toxins, infections, or medications — that barrier starts to break down. Larger particles like undigested food proteins, bacteria, and lipopolysaccharides (LPS, a byproduct of bacterial cell walls) can slip through into the bloodstream.

Your immune system, not recognizing these particles as "safe," mounts a response. The result? Systemic inflammation, immune dysregulation, and a whole cascade of symptoms that can show up all over the body — not just in your gut.

While "leaky gut" isn't always a term you'll hear in a conventional doctor's office, the underlying science is well-documented. Research has linked intestinal permeability to a wide range of chronic conditions, from autoimmune diseases to mood disorders.

Top Leaky Gut Symptoms to Watch For

What makes leaky gut tricky is that its symptoms are incredibly wide-ranging. It doesn't just show up as a stomach ache — it can affect your skin, your brain, your joints, and your energy levels. Here are the most common signs:

1. Chronic Digestive Issues

This is usually the most obvious one. Bloating, gas, cramping, constipation, diarrhea, or alternating between the two are classic signs that something is off in the gut. If these symptoms are ongoing and not explained by another diagnosed condition, intestinal permeability is worth exploring.

2. Food Sensitivities

Leaky gut is one of the most common underlying drivers of food sensitivities. When undigested food proteins cross into the bloodstream, the immune system learns to recognize them as threats. Over time, you may notice that more and more foods seem to trigger reactions — headaches, bloating, fatigue, skin flares, or mood changes. 

If I have a client who does a food sensitivity test and they have a few items they are highly reactive to then this is normal. However, if I have someone who has a dozen or more foods that come up as reactive then this isn't a true food sensitivity-these are signs of a leaky gut that is having an immune reaction to everything.

3. Chronic Fatigue and Low Energy

Inflammation is exhausting. When your immune system is constantly activated due to particles leaking through the gut, your body diverts enormous energy resources to managing that response. The result is a deep, persistent fatigue that doesn't resolve with rest.

4. Brain Fog

The gut-brain connection is very real. Your gut produces a significant portion of your body's serotonin and communicates directly with your brain via the vagus nerve. When gut health is compromised, cognitive symptoms like poor concentration, memory issues, mental sluggishness, and difficulty thinking clearly often follow.

5. Skin Issues

Your skin is a reflection of your gut. Conditions like eczema, psoriasis, acne, rosacea, and unexplained rashes are frequently connected to gut inflammation and increased permeability. When the gut barrier isn't doing its job, the liver and skin can become secondary detox pathways — and they let you know about it.

6. Joint Pain and Inflammation

Systemic inflammation doesn't stay contained to the gut. Aching, stiff, or swollen joints — especially when there's no clear structural cause — can be a downstream effect of the immune activation triggered by leaky gut.

7. Autoimmune Conditions

Research increasingly supports the idea that increased intestinal permeability is a precondition for the development of autoimmune disease. Conditions like Hashimoto's thyroiditis, rheumatoid arthritis, lupus, and celiac disease all have documented links to leaky gut. Functional medicine pioneer Dr. Alessio Fasano's research on zonulin (a protein that regulates gut permeability) has been particularly groundbreaking in this area.

8. Mood Disorders — Anxiety and Depression

The gut microbiome plays a significant role in regulating mood, stress response, and neurotransmitter production. When the gut lining is compromised and inflammation is high, it can directly impact mental health. Many people dealing with anxiety or depression that hasn't fully responded to conventional treatment find that addressing gut health makes a meaningful difference.

9. Hormonal Imbalances

The gut helps metabolize and eliminate excess hormones, particularly estrogen. A leaky gut combined with gut microbiome imbalance (dysbiosis) can disrupt this process, contributing to estrogen dominance, PMS, irregular cycles, and other hormonal symptoms.

10. Nutrient Deficiencies

When the intestinal lining is inflamed and damaged, absorption of key nutrients — including iron, zinc, magnesium, vitamin D, and B vitamins — can be significantly impaired. If you're supplementing but not seeing results, the gut's ability to absorb what you're giving it may be the missing piece.

What Causes Leaky Gut?

Leaky gut doesn't develop overnight. It's typically the result of a combination of factors that accumulate over time:

• Chronic stress: Stress hormones directly impact gut barrier function and the composition of the microbiome.
• The Standard American Diet: High in processed foods, sugar, refined carbohydrates, and industrial seed oils — all of which fuel gut inflammation and dysbiosis.
• Overuse of NSAIDs and antibiotics: These medications can damage the gut lining and deplete beneficial bacteria when used frequently.
• Alcohol: A well-documented driver of intestinal permeability.
• Environmental toxins: Glyphosate (the herbicide in Roundup), heavy metals, mold toxicity, and other environmental exposures have been linked to gut damage.
• Gut dysbiosis: An imbalance between beneficial and harmful bacteria creates a pro-inflammatory environment that degrades the gut lining.
• Unaddressed infections: H. pylori, SIBO (small intestinal bacterial overgrowth), Candida overgrowth, and parasites can all contribute to gut permeability.
• Chronic sleep deprivation: Sleep is when your gut repairs itself. Consistently poor sleep impairs this process.
• Food Sensitivities: Food allergy and food sensitivity are not the same thing. A food sensitivity is an immune reaction that when you consume it regularly causes low grade inflammation and an immune response. Over time, this can cause inflammation in the gut that compromises the integrity of the gut lining. 

Why Does It Matter? The Bigger Picture

Here's what makes leaky gut so significant from a functional medicine standpoint: the gut is not an isolated organ. It's the foundation of the entire immune system (roughly 70% of immune tissue lives in and around the gut), the hub of neurotransmitter production, and a critical regulator of hormonal balance.

When the gut is inflamed and permeable, nothing downstream works optimally. You can take all the supplements in the world, exercise consistently, and do everything "right" — but if your gut isn't absorbing nutrients, if your immune system is chronically activated, and if systemic inflammation is running unchecked, you're going to continue feeling off.

Addressing leaky gut isn't just about improving digestion. It's often the foundational step that makes everything else — energy, mood, hormones, skin, immune function — start to fall back into place.

How to Start Healing Leaky Gut: A Functional Approach

The good news: the gut lining can heal. It's one of the most regenerative tissues in the body — the intestinal cells turn over rapidly, which means that with the right inputs, meaningful improvement can happen within weeks to months. Here's how a functional approach typically addresses leaky gut:

Remove the Triggers

Healing cannot begin if the damage is ongoing. This usually means reducing or eliminating gluten, dairy, sugar, alcohol, and processed foods — at least in the short term. Identifying and removing specific food sensitivities through an elimination diet or testing is also key.

Rebuild the Gut Microbiome

A diverse, balanced microbiome is protective of the gut lining. Incorporating prebiotic-rich foods (garlic, onions, leeks, asparagus, green bananas) and probiotic foods (sauerkraut, kimchi, kefir) alongside a high-quality, targeted probiotic supplement can make a significant difference.

Repair the Gut Lining

Several nutrients have strong evidence for supporting gut barrier integrity. L-glutamine is the primary fuel source for intestinal cells and is foundational to gut repair. Zinc carnosine, collagen/bone broth, and deglycyrrhizinated licorice (DGL) are also commonly used in functional protocols. Butyrate — a short-chain fatty acid produced by beneficial gut bacteria — is another powerful gut-lining supporter.

Reduce Systemic Inflammation

An anti-inflammatory diet rich in colorful vegetables, omega-3 fatty acids (fatty fish, flaxseed, walnuts), and polyphenols (berries, green tea, olive oil) helps lower the inflammatory burden on the gut.

Address the Stress Response

Because the gut-brain axis runs both directions, unmanaged stress can undo even the best dietary and supplement protocols. Practices like breathwork, meditation, yoga, adequate sleep, and nervous system regulation are non-negotiables in true gut healing.

Work with a Specialist to Dig Deeper

Sometimes, leaky gut is driven by deeper factors — SIBO, Candida overgrowth, parasites, mold toxicity, or chronic infections — that require targeted testing and treatment. A functional and integrative health approach uses comprehensive stool testing, organic acids testing, and other tools to identify what's specifically driving your symptoms so that treatment is precise, not guesswork.

Final Thoughts

If you've been reading through this list checking boxes — "yes, that's me... and that... and that" — it's worth taking seriously. These symptoms aren't random, and they aren't just something you have to live with.

Leaky gut is one of those conditions that sits beneath the surface of so many chronic health challenges. Addressing it doesn't just relieve digestive symptoms — it can transform your energy, your mood, your skin, your immune resilience, and your overall quality of life.

You deserve more than being told your labs are "normal" while you still feel terrible. Functional and integrative health care is about finding the why behind your symptoms and creating a personalized roadmap to real, lasting healing.

Ready to Finally Get Answers?

Schedule Your Onboarding Call Today

If you're experiencing several of the symptoms described in this article, it's time to stop guessing and start getting real answers. Our practice uses a comprehensive, root-cause approach to identify what's driving your symptoms — whether that's leaky gut, gut dysbiosis, hormonal imbalances, or something deeper.

Your first step is an onboarding call where we'll take the time to hear your full health story, understand your goals, and explain exactly how our functional approach can help you finally feel like yourself again.

👉 Click here to schedule your onboarding call and take the first step toward healing your gut — and your health.

You don't have to keep living with symptoms that have no explanation. Let's find your root cause — together.

Ashley Drummonds