TL;DR
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Bloated after lunch. Exhausted by 3 p.m. Skin breaking out for no clear reason.
You've probably blamed stress, hormones, or just getting older. But there's a good chance one organ is behind all three: your gut.
Your gut does far more than digest food. It shapes your energy, mood, skin, and immunity. The symptoms above are some of the most common signs of an unhealthy gut. They're also far more widespread than most people realize. Catching them early can help you address an imbalance before it turns into something more persistent.
This guide walks through the 10 signs of an unhealthy gut, what typically causes them, and the practical, science-backed steps that help you start healing.
The 10 Signs of an Unhealthy Gut You Shouldn't Ignore
Your gut houses trillions of microbes that make up your gut microbiome, which influences digestion, immunity, mood, and more. When it is imbalanced here's what you may notice.
1. Constant Bloating and Gas
Passing gas occasionally is normal. But if you're experiencing excessive gas on most days, particularly alongside bloating or digestive discomfort, it may be one of the signs your gut is having trouble digesting certain foods properly. 1
Myth Buster: Bloating isn't always about eating too much. It's often about how your gut processes carbs and fiber.
2. Irregular Bowel Movements (Diarrhea or Constipation)
Going too often, or not enough? Diarrhea, constipation, or irregular bowel movements are some of the clearest unhealthy gut symptoms, often pointing to a disrupted gut microbiome. 2
Fun Fact: A healthy gut usually means 2-3 smooth, easy-to-pass bowel movements a day.
3. Getting Sick More Often Than Usual
About 70-80% of your immune cells live in your gut. If you're catching every cold that goes around, your gut may need some support.3
Also Read: The 8 Best Foods to Boost Your Immune Health
4. Constant Sugar Cravings
The bacteria in your gut are influenced by what you eat. A high-sugar diet can reduce beneficial bacteria like Bifidobacterium while encouraging the growth of some less beneficial microbes, including certain Bacteroides and Clostridium species.
Over time, this imbalance may affect appetite signals and make sugar cravings more frequent, creating a cycle that's difficult to break. 4
5. Fatigue That Doesn't Go Away, Even With Enough Sleep
Poor nutrient absorption or low-grade gut inflammation can leave you feeling drained, even when your diet looks healthy. 5
6. Unexplained Skin Breakouts
Acne, eczema, or rosacea flare-ups can sometimes reflect internal inflammation. When good bacteria are low, harmful bacteria can release compounds that show up on your skin, a connection known as the gut-skin axis.6
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Gut-Skin Axis: Explained The gut-skin axis is the two-way communication line between your gut and your skin. When gut bacteria are out of balance, it can trigger inflammation that travels through your bloodstream and shows up as breakouts, redness, or flare-ups. |
7. Increased Anxiety or Mood Swings
Your gut and brain are in constant contact through the gut-brain axis. This is why the gut is sometimes called the second brain. Over 90% of your body's serotonin, the chemical most linked to mood, is made in your gut.
When gut bacteria are out of balance, that production can be disrupted, sometimes showing up as anxiety or mood swings that seem to come out of nowhere. 7
8. Trouble Falling or Staying Sleep
Your gut plays a role in producing melatonin, the hormone that tells your body it's time to sleep. Specialized cells in your gut lining make their own local supply, separate from what your brain produces.8
When your gut is out of balance, this process can be disrupted, which may be part of why gut issues and poor sleep so often show up together.
9. Persistent Bad Breath
If bad breath persists even after brushing, your gut might be behind it. One common cause is acid reflux (GERD), when stomach acid moves back up into the esophagus and triggers chronic bad breath. 9
Good to Know: GERD stands for gastroesophageal reflux disease, the medical term for chronic acid reflux.
10. New Food Sensitivities
If foods you once digested easily now cause discomfort, your gut might be out of sync. Research suggests gut imbalances can increase food sensitivities over time. 10
These signs of bad gut health don't appear out of nowhere. Understanding what typically causes them is the first step toward fixing the symptoms of poor gut health for good.
What Causes an Unhealthy Gut?
Your gut has its own network of nerves. Scientists call it the enteric nervous system (ENS), or the body's second brain.11 It controls digestion and talks directly to your brain. That's part of why gut problems can affect your mood, not just your stomach.
Several everyday factors can throw this balance off:
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Factor |
How It Affects Your Gut |
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Unhealthy diet (too much sugar, not enough fiber) |
Feeds bad bacteria and reduces healthy variety |
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Constant stress |
Upsets gut balance and increases inflammation |
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Poor sleep |
Throws off the natural rhythm of gut bacteria |
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Not moving enough |
Lowers the number of good bacteria |
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Drinking alcohol / smoking |
Damages the gut lining and kills helpful bacteria |
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Taking antibiotics often |
Wipes out both bad and good bacteria |
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Everyday toxins |
Harm good bacteria and disrupt gut balance |
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Illness or infections |
Can make the gut lining leaky, letting harmful substances through |
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Being overweight |
Changes gut bacteria and raises the risk of related health issues |
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Age, genetics, and how you were born (C-section or vaginal) |
Affect how gut bacteria develop from the start |
How to Improve Gut Health Naturally
Eat a wide variety of plant-based foods, add fermented foods, cut back on added sugar, drink enough water, manage stress, and get enough sleep. These six habits have the strongest evidence behind them.
Here's where to start:
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Eat a Wide Variety of Plant Foods, Not Just More Fiber
A large gut health study found that people who ate 30 or more different plant foods a week had more diverse gut bacteria than those who ate fewer than 10.
Researchers also found that the variety of plant foods people consumed was more strongly associated with gut microbial diversity than whether they identified as vegetarian, vegan, or omnivore.
Try this:
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Go for 2-3 new vegetables, fruits, or grains each week instead of buying the same ones.
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Add herbs, spices, nuts, and seeds. They count as plants too.
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Aim for color. A colorful plate usually means more variety.
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Add Fermented Foods to Your Routine
People who eat more fermented foods, like yogurt, kefir, kimchi, and sauerkraut, tend to have more diverse gut bacteria and lower inflammation. Fiber matters too, but fermented foods often show benefits faster. 12
Try this:
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Add one small serving of a fermented food to one meal a day.
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Start small like a spoonful of kimchi, a small bowl of yogurt, or a glass of kefir.
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If food alone doesn't feel like enough, ask your doctor about a probiotic supplement, especially if you're pregnant, nursing, or on medication. 13
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Cut Back on Sugar and Processed Food
Added sugar and heavily processed foods feed the bacteria that crowd out the good ones in your gut. Processed foods are also usually low in fiber, which means less food for the bacteria that actually helps you. Over time, this combination can shift your gut balance in the wrong direction.
Try this:
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Swap soda for sparkling water.
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Swap chips for a handful of nuts.
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Check labels; sugar hides in sauces, dressings, and healthy snack bars too.
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Stay Hydrated
Water helps your gut bacteria stay diverse. It also helps move food through your digestive system, which keeps things running smoothly.
Try this:
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Keep a water bottle at your desk or in your bag as a visual reminder.
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Drink a glass of water first thing in the morning.
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Herbal tea and water-rich foods (like cucumber or watermelon) count too.
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Manage Stress
Stress doesn't just affect your mind, it also affects your gut bacteria and digestion. 14
Try this:
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Try 5 minutes of deep breathing before meals.
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Take a short walk after eating instead of sitting right away.
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Build in one calming activity a day, even if it's just 10 minutes.
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Prioritize Sleep
Your gut repairs itself while you sleep. Skimping on sleep can throw that process off.
Try this:
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Aim for 7-9 hours a night.
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Keep a consistent bedtime, even on weekends.
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Put your phone away 30 minutes before bed.
Gut Health: Safety And When to See a Doctor
Most of these habits are safe for most people, but a few things to keep in mind:
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Talk to your doctor before starting a probiotic, especially if you're pregnant, nursing, immunocompromised, or on medication.
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Add fiber gradually. Too much too fast can cause gas or bloating.
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See a doctor right away if you notice blood in your stool, sudden weight loss, or severe ongoing stomach pain.
The Bottom Line
Your body has its own way of dropping hints, especially when your gut is out of balance. The 10 signs of an unhealthy gut discussed above are clues that something deeper might be going on. If left unaddressed, that imbalance can grow into longer-term issues.
You don't need to fix everything at once. Pick one habit from this guide and start today. Add fermented food to one meal, drink a glass of water first thing, or go to bed 30 minutes earlier. Small changes compound. Give it a few weeks before judging whether it's working.
Want a little extra support while you build these habits?
Our Balanced Gut Essentials bundle pairs Bovine Colostrum, Cell D-Tox, and Eannatto 150+ to support your gut lining, ease detoxification, and calm inflammation; three angles working together instead of one supplement doing it alone.
Frequently Asked Questions
Q1: Can an unhealthy gut cause brain fog?
Yes. Your gut and brain are closely connected, and inflammation from an imbalanced gut can affect focus and mental clarity. If you're dealing with bloating, fatigue, and brain fog together, they may share the same root cause. 15
Q2: How long does it take to heal an unhealthy gut?
Many people notice small improvements, like less bloating, within 2 to 4 weeks of consistent habits. Deeper healing, like a more balanced microbiome, typically takes 3 to 6 months. Everyone's timeline is different, so consistency matters more than speed.
Q4: What is the 7-day gut reset?
There's no single official medical protocol by that name; it's typically used to describe a short-term focus on whole foods, added fiber, and reduced sugar and alcohol. Sustainable gut health comes from ongoing habits, not a one-week fix.
Q5: What are the 5 worst foods for gut health?
Highly processed foods, added sugars, fried foods, artificial sweeteners, and excessive alcohol are generally considered the biggest everyday strains on gut bacteria.
References:
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National Institute of Diabetes and Digestive and Kidney Diseases. (n.d.). Gas in the digestive tract. U.S. Department of Health and Human Services, National Institutes of Health. https://www.niddk.nih.gov/health-information/digestive-diseases/gas-digestive-tract
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Healthdirect Australia. (n.d.). What your poo (stool) says about your health. https://www.healthdirect.gov.au/blog/what-your-poo-says-about-your-health
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Wiertsema, S. P., van Bergenhenegouwen, J., Garssen, J., & Knippels, L. M. (2021). The interplay between the gut microbiome and the immune system in the context of infectious diseases throughout life and the role of nutrition in optimizing treatment strategies. Nutrients, 13(3), 886. https://www.mdpi.com/2072-6643/13/3/886
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Di Rienzi, S. C., & Britton, R. A. (2020). Adaptation of the gut microbiota to modern dietary sugars and sweeteners. Advances in nutrition, 11(3), 616-629. https://www.sciencedirect.com/science/article/pii/S2161831322002885?via%3Dihub
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Boolani, A., Gallivan, K. M., Ondrak, K. S., Christopher, C. J., Castro, H. F., Campagna, S. R., ... & Byerley, L. O. (2022). Trait energy and fatigue may be connected to gut bacteria among young physically active adults: an exploratory study. Nutrients, 14(3), 466. https://pmc.ncbi.nlm.nih.gov/articles/PMC8839554/
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Ellis, S. R., Nguyen, M., Vaughn, A. R., Notay, M., Burney, W. A., Sandhu, S., & Sivamani, R. K. (2019). The skin and gut microbiome and its role in common dermatologic conditions. Microorganisms, 7(11), 550. https://pmc.ncbi.nlm.nih.gov/articles/PMC6920876/
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Chaudhry, T. S., Senapati, S. G., Gadam, S., Mannam, H. P. S. S., Voruganti, H. V., Abbasi, Z., ... & Arunachalam, S. P. (2023). The impact of microbiota on the gut–brain axis: Examining the complex interplay and implications. Journal of clinical medicine, 12(16), 5231. https://pmc.ncbi.nlm.nih.gov/articles/PMC10455396/
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Zimmermann, P., Kurth, S., Pugin, B., & Bokulich, N. A. (2024). Microbial melatonin metabolism in the human intestine as a therapeutic target for dysbiosis and rhythm disorders. npj Biofilms and Microbiomes, 10(1), 139. https://www.nature.com/articles/s41522-024-00605-6
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Wellbery, C. (2008). Positive association between GERD and halitosis. American Family Physician, 78(6), 767–768. https://www.aafp.org/afp/2008/0915/p767
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Caminero, A., Meisel, M., Jabri, B., & Verdu, E. F. (2019). Mechanisms by which gut microorganisms influence food sensitivities. Nature Reviews Gastroenterology & Hepatology, 16(1), 7-18. https://www.nature.com/articles/s41575-018-0064-z
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Gerrie, H. (2021, October). Our second brain: More than a gut feeling. UBC Department of Cellular and Physiological Sciences, Neuroscience. https://neuroscience.ubc.ca/our-second-brain-more-than-a-gut-feeling/
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Weaver, J. (2021, July 12). Fermented-food diet increases microbiome diversity, decreases inflammatory proteins, study finds. Stanford Medicine News Center. https://med.stanford.edu/news/all-news/2021/07/fermented-food-diet-increases-microbiome-diversity-lowers-inflammation.html
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Maftei, N. M., Raileanu, C. R., Balta, A. A., Ambrose, L., Boev, M., Marin, D. B., & Lisa, E. L. (2024). The potential impact of probiotics on human health: an update on their health-promoting properties. Microorganisms, 12(2), 234. https://www.mdpi.com/2076-2607/12/2/234
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Madison, A., & Kiecolt-Glaser, J. K. (2019). Stress, depression, diet, and the gut microbiota: human–bacteria interactions at the core of psychoneuroimmunology and nutrition. Current opinion in behavioral sciences, 28, 105-110. https://www.sciencedirect.com/science/article/abs/pii/S2352154618301608
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Zhang, R., Ding, N., Feng, X., & Liao, W. (2025). The gut microbiome, immune modulation, and cognitive decline: insights on the gut-brain axis. Frontiers in Immunology, 16, 1529958. https://pmc.ncbi.nlm.nih.gov/articles/PMC11794507/
Disclaimer: This article is for informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider regarding any medical concerns or conditions.
