My Dermatologist Put Me on Antibiotics for MONTHS. What Happened to My Gut Changed Everything.
SPOILER: The antibiotics did not clear my skin. What they did do was completely dismantle my gut.
I started experiencing things I had never dealt with before. Bloating after almost every meal. Persistent gas. Diarrhea that became my new normal. A sudden sensitivity to foods I had eaten my entire life without a single problem. I felt inflamed, exhausted, and like my body had turned into something I did not recognize.
At the time, I had no idea those two things were connected. My skin and my gut felt like completely separate issues. It took me a long time to understand that what was happening in my intestines was driving almost everything I was experiencing physically.
That experience is what eventually led me to functional nutrition. And leaky gut is one of the first things I look at with almost every client I work with, because it is far more common than most people realize, and far more connected to symptoms that seem to have nothing to do with digestion.
What Is Leaky Gut, Actually?
Leaky gut, or intestinal permeability, refers to a condition where the lining of the small intestine becomes damaged and more permeable than it should be.
Here is how it works. Your gut lining is made up of a single layer of tightly connected cells. Those tight junctions act as a selective barrier, allowing nutrients to pass into the bloodstream while keeping out bacteria, toxins, undigested food particles, and other substances that have no business being there.
When that lining is compromised, those tight junctions loosen. Particles that should stay inside the gut begin passing through into the bloodstream. Your immune system recognizes them as foreign and mounts a response. That response creates inflammation. And that inflammation does not stay local. It travels.
This is why leaky gut shows up in symptoms that seem completely unrelated to your stomach.
What Causes Leaky Gut
This is where the modern lifestyle piece matters. Leaky gut does not usually happen from one thing. It is typically the cumulative result of several factors working against the gut lining over time.
Antibiotics and medications. This was my own entry point. Long-term antibiotic use disrupts the gut microbiome by killing off beneficial bacteria alongside the harmful ones. Without a healthy microbial balance, the gut lining becomes vulnerable. NSAIDs like ibuprofen and acid-blocking medications can also contribute to gut permeability with prolonged use.
Chronic stress. This one surprises people, but the gut and the nervous system are deeply connected through what is called the gut-brain axis. When the body is in a chronic stress response, digestion is deprioritized and the gut lining takes a hit. Stress is one of the most underestimated drivers of gut issues I see in the women I work with.
Diet. A diet high in processed foods, refined sugar, and inflammatory oils and low in fiber, fermented foods, and nutrients depletes the gut microbiome and weakens the mucosal lining over time.
Environmental toxins. Pesticide residues, food additives, and certain chemicals in everyday products can disrupt gut bacteria and contribute to permeability.
Hormonal fluctuations. Estrogen and progesterone both influence gut motility and the integrity of the gut lining. This is part of why so many women notice their gut symptoms shift during their cycle, postpartum, or during perimenopause.
Symptoms of Leaky Gut That Most Women Do Not Connect to Their Gut
This is the part that matters most for most people reading this. Because leaky gut does not always look like a gut problem.
Yes, digestive symptoms like bloating, gas, constipation, diarrhea, and cramping are common. But leaky gut regularly shows up as things that seem completely unrelated.
Skin issues. Acne, eczema, rosacea, and chronic skin inflammation often have a gut component. The gut-skin axis is well established, and when the gut lining is compromised, that inflammatory response frequently surfaces on the skin.
Fatigue that does not resolve with sleep. When the immune system is chronically activated by particles leaking through the gut, energy gets redirected toward that immune response. The result is a kind of deep, systemic tiredness that is not fixed by a good night's rest.
Brain fog and mood changes. The gut produces a significant portion of the body's serotonin. When gut health is compromised, neurotransmitter production is affected. Anxiety, depression, difficulty concentrating, and mental fogginess all have a gut connection that is increasingly supported by research.
Food sensitivities that seem to multiply. When the gut lining is permeable, the immune system is repeatedly exposed to food proteins that would normally be digested before reaching the bloodstream. Over time it begins reacting to more and more foods. This is why clients come to me eating a shorter and shorter list of safe foods.
Joint pain and unexplained inflammation. The systemic inflammation driven by intestinal permeability can manifest as joint pain, stiffness, and widespread body aches.
Frequent illness. Approximately 70 percent of the immune system lives in and around the gut. When gut health is compromised, immune function follows.
Hormonal imbalances. The gut plays a direct role in how hormones are metabolized and cleared from the body. A compromised gut lining and disrupted microbiome can interfere with estrogen metabolism specifically, contributing to hormonal symptoms that seem unrelated to digestion.
The Connection Between Leaky Gut and Hormones
This connection deserves its own section because it is one of the most overlooked pieces in women's health.
There is a collection of gut bacteria called the estrobolome that is specifically responsible for metabolizing and regulating estrogen in the body. When the gut microbiome is disrupted and the lining is compromised, the estrobolome cannot do its job properly. Estrogen that should be cleared from the body gets recirculated instead.
This can show up as estrogen dominance symptoms including heavy or irregular periods, worsening PMS, breast tenderness, mood instability, and difficulty losing weight. All of which look like hormone problems on the surface, with a gut problem driving them underneath.
If you are navigating perimenopause or hormonal symptoms, this post goes deeper into what is happening hormonally and why gut health is part of that picture.
How to Start Healing Leaky Gut
The gut lining has a remarkable capacity to repair itself when given the right conditions. This is not a quick fix, and it requires addressing the root causes rather than just managing symptoms. But it is absolutely possible.
Nourishment comes first. Whole, nutrient-dense foods provide the raw materials the gut lining needs to rebuild. Bone broth, collagen-rich foods, fermented vegetables, fiber-rich produce, and quality proteins all support gut lining integrity. It is worth noting that protein is a direct building block of the gut lining itself. Under-eating protein slows the repair process significantly.
Remove the irritants. Reducing or eliminating processed foods, refined sugar, alcohol, and any foods you are currently reacting to gives the gut lining space to heal without being constantly retriggered.
Support the microbiome. Fermented foods, prebiotic fiber, and a quality probiotic help restore bacterial balance. The right probiotic matters here, which is why I prefer to personalize this rather than give a blanket recommendation.
Address stress. I cannot overstate this one. If the nervous system is chronically dysregulated, healing the gut lining is an uphill battle. Nervous system support is not optional in gut healing work, it is foundational.
Targeted supplementation. Certain nutrients are particularly well supported for gut lining repair: L-glutamine, zinc carnosine, collagen peptides, omega-3 fatty acids, and specific probiotic strains. I have a curated Gut Healing Protocol on Fullscript with the practitioner-grade products I use with my own clients, available to you at a discount.
The Bottom Line on Leaky Gut
Leaky gut is not a fringe wellness concept. Intestinal permeability is a recognized and increasingly researched condition with real downstream effects on immunity, hormones, skin, mood, energy, and overall health.
If you have been dealing with symptoms that do not seem connected, that conventional medicine has not been able to fully explain, your gut lining is worth looking at.
Your body is not working against you. It is communicating. And the gut is often the first place that communication starts.
Frequently Asked Questions About Leaky Gut
Is leaky gut a real medical condition? Intestinal permeability is a recognized and measurable phenomenon supported by published research. The term "leaky gut syndrome" is used more broadly in functional and integrative medicine to describe the downstream effects of increased gut permeability. While mainstream medicine is still catching up on the full clinical picture, the underlying mechanism is well established in the scientific literature.
What are the most common signs of leaky gut in women? The most common signs include bloating and digestive discomfort, skin issues like acne or eczema, fatigue that does not resolve with rest, brain fog, food sensitivities that seem to be multiplying, mood changes including anxiety or irritability, joint pain, frequent illness, and hormonal irregularities. Many women are surprised to learn that symptoms they assumed were unrelated to digestion often have a gut component.
Can stress cause leaky gut? Yes. Chronic stress activates the body's stress response, which directly impacts gut motility and the integrity of the gut lining through the gut-brain axis. Stress also disrupts the gut microbiome over time. This is one of the reasons nervous system support is a core part of gut healing work, not an add-on.
How long does it take to heal leaky gut? It depends on how long the gut has been compromised, what the underlying causes are, and how consistently the healing protocol is followed. Some people notice meaningful improvement in symptoms within four to eight weeks of targeted dietary and lifestyle changes. Deeper repair and microbiome restoration typically takes several months. This is a process, not a quick fix.
Can leaky gut cause weight gain? Yes, indirectly. The systemic inflammation driven by intestinal permeability can interfere with insulin sensitivity, cortisol regulation, and hormone metabolism, all of which affect body composition and weight. Many clients who have struggled with weight loss resistance find that addressing gut health is a meaningful part of what shifts things for them.
What is the difference between leaky gut and IBS? IBS is a diagnosis based on symptoms, primarily changes in bowel habits and abdominal discomfort. Leaky gut refers specifically to the increased permeability of the gut lining. The two can overlap significantly, and intestinal permeability is believed to be a contributing factor in many IBS presentations, but they are not the same thing. A functional nutrition approach looks at both.
How do I know if I have leaky gut? There are functional tests that can assess gut permeability and microbiome health, including stool analysis and specific blood markers. Inside my coaching programs, we use a combination of detailed symptom assessment and, where indicated, functional lab work to build a clear picture of what is happening in the gut. If you are experiencing several of the symptoms described in this post, it is worth having a conversation.
If this resonates and you want to understand what is actually going on with your gut, this is exactly the work we do inside my 12-week functional wellness coaching program. Book a Strategy Call
About the Author Chrystal is a functional nutritionist, wellness coach, and founder of Nourish Up, a functional nutrition and holistic wellness practice based in California. Her own experience with antibiotic-induced gut damage sparked a decade of study in functional nutrition and a deep specialization in gut health, hormone support, and root-cause wellness for women and families. She helps clients connect the dots between symptoms that seem unrelated and build sustainable health from the inside out.