You read that you might have a leaky gut, and it fits: the bloating, the gas, the foods that do not sit right, the tiredness. It is natural to want a name for it. This guide, written for adults across the Triangle who are sorting through what they have read online, gives you a balanced picture. Part of the leaky gut story is solid science. Part of it goes further than the evidence.
For the wider picture of everyday gut care, start with our guide to how to improve gut health naturally. This article stays with one question: what is leaky gut, and what should you do about symptoms that seem to match it?
What is leaky gut?
"Leaky gut" is a nickname for increased intestinal permeability, meaning the lining of your intestines lets more through than usual. Some permeability is normal: the lining is meant to let water and nutrients in while keeping bacteria and other unwanted material out.
Cleveland Clinic puts it this way: everyone's gut is semi-permeable. The lining of the intestines is designed to absorb water and nutrients into the bloodstream, and some people have increased permeability, so their guts let more than water and nutrients through.1 Harvard Health describes the lining as covering more than 4,000 square feet. When it works well, it forms a tight barrier that controls what is absorbed. It also says we all have some degree of "leakiness," because the barrier is not completely impenetrable and is not supposed to be.3
So permeability is a spectrum. The research question is what happens when it increases, and whether that is a cause of disease or a result of it.
Is leaky gut syndrome a recognized condition?
No. Increased intestinal permeability is real and measurable in research, but "leaky gut syndrome" as a stand-alone condition is not a recognized medical diagnosis. Two respected medical centers say so plainly.
Cleveland Clinic calls leaky gut syndrome a hypothetical condition. It is a theory that permeability is not only a result of digestive disease but an underlying cause that develops on its own. Cleveland Clinic says the evidence for that theory is lacking: we know that increased permeability is real, but we do not know that it is a disease in itself or that it causes other diseases.1 Harvard Health likewise says leaky gut syndrome is not a clinical diagnosis.2
Here is what is established. Increased permeability is a recognized feature of several inflammatory and autoimmune digestive diseases, including inflammatory bowel disease and celiac disease. In those cases, scientists generally consider it a symptom, not a cause.1 Harvard Health adds that increased permeability plays a role in celiac disease, Crohn's disease and irritable bowel syndrome.3
What is not established is the bigger claim. Harvard Health says some studies link leaky gut with autoimmune diseases, chronic fatigue syndrome, fibromyalgia, arthritis, allergies, asthma, acne, obesity and even mental illness. But there are not yet studies in humans showing that it causes any of them.3 A link found in a study is not the same as a cause.
What symptoms do people link to leaky gut?
People link bloating, abdominal pain, indigestion and food sensitivities to leaky gut. But Cleveland Clinic says no symptoms are associated directly with intestinal permeability, and these complaints have many more common explanations.1
Cleveland Clinic lists the symptoms most people who suspect leaky gut describe: abdominal pain, food sensitivities, bloating and indigestion. It says these are common, have many possible explanations, and that you do not have to have a leaky gut to experience them.1 The symptoms that can follow real injury to the intestinal lining include a burning feeling of ulceration, painful indigestion, diarrhea, gas and bloating from overgrown bacteria, and low energy.1 Cleveland Clinic ties those symptoms to the underlying injury, not to permeability itself.
Cleveland Clinic also makes a pointed observation. "Leaky gut syndrome" has become a catch-all label for general indigestion and possibly many other problems, but true hyperpermeability is too specific and too extreme to explain most people's symptoms.1 In plain terms: your symptoms are real, and they deserve an answer, but "leaky gut" is rarely the best answer.
What conditions can look like leaky gut?
Several common, checkable conditions cause the same symptoms: irritable bowel syndrome, celiac disease, food intolerances such as lactose intolerance, bacterial overgrowth and constipation. Your own doctor can look for these.
| Condition | What it can look like | What the source says |
|---|---|---|
| Irritable bowel syndrome (IBS) | Cramping, belly pain, bloating, gas, diarrhea, constipation | A common condition; the digestive tract looks normal but does not work as it should5 |
| Celiac disease | Digestive symptoms, and it can affect the body outside the gut | An immune disorder triggered by gluten that damages the small intestine; many people who have it have not been diagnosed4 |
| Lactose intolerance | Bloating, gas, diarrhea after milk products | Caused by lactose malabsorption; only people with symptoms are lactose intolerant7 |
| Small intestinal bacterial overgrowth | Extra gas, sometimes diarrhea and weight loss | More bacteria, or a different type, in the small intestine; most often a complication of other conditions6 |
| Constipation | Bloating and gas | Listed by NIDDK among the conditions that can cause gas symptoms6 |
NIDDK says celiac disease affects an estimated 2 million people in the United States, and that many people with it have not been diagnosed.4 It also says gluten sensitivity can cause symptoms like abdominal pain and tiredness, but unlike celiac disease it does not damage the small intestine.4 About 36 percent of people in the United States have lactose malabsorption, though not everyone with it has symptoms.7
This is why guessing is risky. If you cut out a food group on your own because of a leaky gut theory, you might blur the picture before your doctor has had a chance to look. Talk with your doctor before you remove whole food groups.
What habits support the gut lining?
Habits that support the gut overall are the same ones that appear in any good gut guide: a varied, mostly whole-food diet, less alcohol, less processed food, and attention to stress. None of them is a fix for permeability, and Cleveland Clinic is honest about that.
Cleveland Clinic says the gut lining is built to repair and replenish itself. It describes everyday factors, such as diet, stress and bacterial overgrowth, that can wear on it. It says certain approaches may not change a disease but may help with those everyday factors and general symptoms.1 They include:
- Plant fiber. Cleveland Clinic names prebiotics, which are usually plant fibers, as food for the helpful bacteria in your gut.1 The gut microbiome needs a variety of plant fibers to thrive.8 Mayo Clinic suggests adding fiber slowly over a few weeks and drinking plenty of water.9
- Less dietary fat and sugar. Cleveland Clinic says dietary fats and sugars encourage the growth of the wrong kinds of gut bacteria.1
- Less alcohol. Chronic heavy alcohol use is among the known causes of intestinal injury.1 Harvard Health says heavy alcohol use and stress also seem to disrupt the gut's balance, and calls the evidence on the standard American diet "emerging."3
- Easing stress. Cleveland Clinic points to cumulative poor diet, chronic stress and other common factors, and says to try reducing them.1
- A review of pain relievers. Cleveland Clinic lists chronic overuse of NSAIDs, such as aspirin and ibuprofen, as a known cause of intestinal injury.1 If you take one often, tell your doctor. Do not stop a medicine on your own.
Harvard Health also notes that a nutritious, unprocessed diet that includes anti-inflammatory foods may, at least in theory, help rebuild the gut lining and bring more balance to the gut flora.3 The words "at least in theory" are worth keeping. A varied diet is good for you for many reasons, and it is a sensible thing to try. It is not a promise.
What about products sold for leaky gut? Cleveland Clinic says treatments that target the intestinal lining independently have not been shown to improve the diseases linked to permeability, or to stop permeability from recurring.1 If you are weighing a supplement, ask your doctor or pharmacist first, especially if you take medicines.
What can your doctor actually check?
Your doctor cannot measure leaky gut directly, but can check for the conditions that cause the same symptoms. This is usually more useful than a permeability test.
Cleveland Clinic says there is no standard test to measure intestinal permeability directly in patients. Several kinds of tests are under investigation in research, but they are not part of routine care.1 Harvard Health says that, to work out what is behind bloating and gas, your doctor will likely ask about the foods, supplements and medicines you take, and may order blood tests or an endoscopic exam to look for infections or structural causes.2
To get the most from a visit, keep a short diary for two weeks: what you eat, what you feel, and when. Note anything that has changed, such as a new medicine or a stressful stretch. Mention any family history of celiac disease, which is more likely if someone in your family has it, or of inflammatory bowel disease.4 You can also take this article.
When should you see your own doctor?
See your own doctor if you have gut symptoms that last more than a few weeks, keep returning, or come with any warning sign. Harvard Health says anyone with chronic intestinal symptoms, such as ongoing gas and bloating, should see a doctor, because there are many possible reasons for them.2
Cleveland Clinic suggests trying to reduce factors like poor diet and chronic stress first. If that does not help, it advises seeking medical advice, and says a qualified gastroenterologist can help sort through the possible causes.1
Do not wait if you notice any of these:
- Losing a lot of weight for no reason.
- Bleeding from your bottom, or bloody diarrhea.
- A hard lump or swelling in your belly.
- Shortness of breath, noticeable heartbeats and skin that is paler than usual.
The NHS lists all four as signs that could point to something more serious.10 Mayo Clinic adds diarrhea at night, iron deficiency anemia, unexplained vomiting, and pain that is not relieved by passing gas or stool.5 NIDDK says black or tarry stool, or dark or bright red blood mixed with stool, can be signs of GI bleeding.12 The NHS also says bloating that does not go away can sometimes be a sign of something more serious, such as ovarian cancer.11
Emergency. With a swollen stomach, the NHS lists a severe stomach ache that came on suddenly, vomiting blood or vomit that looks like ground coffee, or severe difficulty breathing as emergencies.11 NIDDK says to seek emergency help for signs of severe GI bleeding, such as confusion, a fast heart rate, pale skin or cold, sweaty skin.12 In the United States, call 911.
Crisis. If worry about your health ever becomes thoughts of harming yourself, call or text 988, the Suicide & Crisis Lifeline.
How does Dr. Werness approach gut symptoms?
Dr. Werness, a naturopathic doctor, starts with the whole of daily life and works alongside your own doctor, not in place of one. He never asks anyone to stop a medicine, and he starts with one change instead of ten.
For gut symptoms that means looking at food (Soil), stress (Roots), sleep (Rhythm), movement and time outside (Ground) and the people around you (Circle). A leaky gut label is less helpful than a clear picture of what you eat, how you sleep and what stresses you, plus the results of any tests your own doctor orders.
If you want help seeing where to begin, the free Garden Check-in takes about three minutes. For the two most common gut questions behind this one, read about bloating after eating and IBS natural remedies.