Progesterone and Gut Health
Bloating, slow digestion, constipation, reflux, stomach pain, gallbladder issues: GI disorders and problems with gut health such as IBS, biliary concerns, and gastritis are extremely common. We treat all of these gut conditions regularly in our clinic, and we have noted an increased incidence of these in patients with PCOS, perimenopause, irregular cycles, and insulin resistance, all hormonal conditions. Progesterone is an important and often overlooked hormone in gut health, and understanding how it affects digestion can change the way you think about your symptoms.
By Dr. Fiona McCulloch, ND, author of 8 Steps to Reverse Your PCOS
If you are experiencing unexplained digestive symptoms alongside hormone health concerns, our naturopathic doctors can assess both together. Book a consultation.
When Gut Symptoms Don't Respond to Conventional Approaches
Many patients we see have already been through a familiar cycle: visits to a gastroenterologist, elimination diets, over-the-counter antacids, proton pump inhibitors, and perhaps a diagnosis of IBS without a clear path forward. These approaches are not wrong, but they address the gut in isolation. What they often miss is the hormonal component. Insulin resistance, for example, is a hormonal problem that directly affects gut motility and biliary function, yet it is rarely framed that way in conventional GI care.
Living with unexplained gut symptoms is exhausting. The uncertainty of not knowing what is causing the problem, combined with how digestive issues can affect meals, social situations, and daily routine, takes a real toll. It is common for patients to feel dismissed when standard testing comes back normal but symptoms persist.
What happens to the gut if someone doesn’t ovulate, or has low levels of progesterone? This question is at the heart of a connection that is extremely common in PCOS, endometriosis, and perimenopause, all conditions where we see an increase in gut symptoms. If you have one of these conditions and have been struggling with digestive issues, the hormonal angle may be the piece that has been missing.
The Hormonal Root of Digestive Problems
Most health content frames progesterone as a GI disruptor, something that slows digestion and causes bloating, particularly during pregnancy. The clinical picture is more nuanced. Research suggests that progesterone plays a protective and regulatory role in the gut: supporting the intestinal lining, modulating immune responses, and helping regulate motility. When progesterone is low or absent, as it is in PCOS, anovulatory cycles, and perimenopause, the gut loses these protective effects. It is important to understand that progesterone does not directly treat symptoms like constipation, diarrhea, or bloating. However, not having adequate progesterone for the proper amount of time can impact inflammation and the normal immune health of the gut, which may contribute to why these symptoms develop or persist.
We don’t always think of insulin as a hormone, but insulin resistance is a hormonal problem, and it directly affects gut motility and biliary function. Many patients with gut motility issues actually have insulin resistance. They may present with fatty liver, weight gain around the midsection, bloating, and in some cases small intestinal bacterial overgrowth (SIBO). This connection between insulin resistance and the microbiome is commonly missed because conventional GI care does not typically frame insulin as part of the hormonal picture. In patients with PCOS, this overlap is especially common.
Hormones work in systems, not in isolation. Estrogen, progesterone, and insulin all interact with each other and with gut function in ways that can’t be reduced to a single variable. That systems-level perspective is important for understanding why your symptoms may not have responded to approaches that address the gut alone. Here is what the research shows about how progesterone specifically affects each part of the digestive system.
Does Progesterone Affect Fullness and Stomach Emptying?
If you feel full quickly after eating, or notice that your appetite changes through your menstrual cycle, progesterone may be part of the reason.
When looking at sex hormone profiles, one study on reproductive aged patients found that esophageal-gastric emptying was slower in those with healthy progesterone levels, likely resulting in an earlier feeling of fullness or “satiety” after meals.
Another study found that patients had a slower gastric emptying time during the follicular phase of the cycle, when progesterone levels are lower.
In peri or postmenopausal patients, however, other studies did not see any impact on esophageal/gastric emptying based on natural levels or in using progesterone as a hormonal treatment. The research on PCOS and gut peptides such as CCK adds additional context to how hormones interact with satiety signaling.
Does Progesterone Slow Digestion? Gut Motility, Constipation, and Bloating
Most studies have shown that progesterone decreases GI muscle cell contractions, relaxing the gut and moderating motility.
It’s important to consider that progesterone, like many hormones, works in concert with other processes of the body.
For healthy motility, the gut needs to move in the right way, at the right time. It’s possible that healthy levels of progesterone are involved in this to some degree.
Two different studies have assessed the impact of menstrual cycle phases on GI transit (how long it takes for a meal to pass through the gut).
GI transit time was significantly longer in the luteal phase where progesterone is dominant, compared to the follicular phase. Another study looked at breath tests after ingesting lactulose, a way to measure transit time, and found that it was increased in the luteal phase of the cycle. Another study found that in menopausal women, oral micronized progesterone and estrogen plus progesterone also increased large intestinal transit time compared to placebo.
A common question is whether progesterone directly causes constipation, diarrhea, or bloating. In clinical practice, progesterone does not directly treat these symptoms. However, not having progesterone in the body for the proper amount of time can definitely impact inflammation and normal immune health in the gut. High levels of hormones, such as those in pregnancy, do tend to be constipating, but clinical progesterone therapy aims for normal physiological levels, not the extremely high levels of pregnancy. Bloating in particular tends to be caused by poor digestion, small intestinal bacterial overgrowth, enzyme deficiencies, or biliary deficiency; it depends on the individual. Healthy hormone balance optimizes immune health, gut immune health, and motilit
Progesterone and Intestinal Permeability (Leaky Gut)
If you experience food sensitivities, inflammation, or GI symptoms that seem disproportionate to what you eat, intestinal permeability may be a factor.
Progesterone also may reduce leaky gut, a name for a common problem where the lining of the intestine becomes more “permeable.”
Tight junctions that attach cells lining the intestine to each other are critical in that they prevent contents of the intestine from entering the body without being digested and processed.
When these tight junctions are disrupted by inflammation or other problems in the gut, contents of the intestine can access the immune system underneath the gut, resulting in inflammation, food reactions, or gastrointestinal symptoms.
A 2019 study on pregnant patients found that progesterone may play an important role in decreasing intestinal permeability by improving tight junctions and reducing systemic inflammation during pregnancy.
Progesterone and Gallbladder and Biliary Motility
After consuming high fat foods, a hormone known as CCK is released from the small intestines.
Some effects of CCK:
- Causes the gallbladder to contract in specific rhythms that help release bile.
- Produces a sense of satiety and has even been found to affect the brain and conditions such as anxiety.
It’s known that the biliary system and its function is commonly altered in PCOS. It’s also known that gallbladder and biliary problems often occur around pregnancy and perimenopause, times where there are profound changes in levels of progesterone.
The conclusion from a variety of studies is that progesterone can regulate and calm the contraction of the gallbladder when stimulated by CCK. This may be quite relevant in patients who experience biliary or gallbladder colic, dilated biliary ducts, or gallbladder “sludge,” but more research needs to be completed on specific pathologies to learn more.
According to research, both estrogen and progesterone have been found to increase the fasting volume of bile in the gallbladder without changing the residual volume of bile left in the gallbladder after meals.
In our clinical practice, we also commonly observe that many patients with gallbladder and biliary concerns have insulin resistance alongside progesterone-related dysfunction. Insulin resistance impacts biliary motility as well, which may help explain why biliary problems are so common in patients with PCOS and metabolic concerns. Assessing both the hormonal and metabolic picture is important when insulin resistance and the microbiome may be part of the clinical picture.
Progesterone and GERD: Does Progesterone Cause Heartburn or Reflux?
GERD, commonly known as reflux, occurs when the stomach contents rise up into the esophagus. Symptoms of reflux include burning, pain, acidic sensations in the throat, cough, and many more.
This condition often includes altered function/motility of the esophageal and gastric muscles, altered gastric secretions, impaired acid clearance, and impaired defense against injury in the area.
In general, it seems that progesterone primarily affects the pressure of the lower esophageal sphincter, which is at the top of the stomach and regulates the opening and closing of the entry point to the stomach. Studies have investigated reflux and GERD in different phases of the menstrual cycle and most have found no clinical correlation to reflux symptoms at natural physiologic levels.
There are no human studies on micronized progesterone therapy and reflux.
In pregnancy, extremely high levels of hormones along with increased abdominal pressure could be involved in contributing to reflux, which is very common in this group.
Progesterone does likely have an impact on reflux but likely works in concert with multiple other factors. It would be interesting to see more human studies on this topic, since reflux affects 25% of people.
Progesterone, Gastritis, H. Pylori, and Stomach Ulcers
Ulcers are a common cause of stomach and gut pain. Ulcers form when the mucous lining of the stomach or duodenum is disrupted. This break in the protective barrier results in inflammation and pain. Ulcers can be associated with H. pylori infection, with taking ibuprofen or NSAIDs for pain, and are a major source of discomfort and impact on quality of life.
Both progesterone and estrogen are thought to have a protective effect on the development of gastric and duodenal ulcers, by promoting healing of the gut lining and activating the production of mucous and helping to generate cells that line the stomach.
Not many studies have reviewed the impact of progesterone on H. pylori and ulcers, but we have a bit of information to look at. An animal study reviewed the incidence and type of gastritis with respect to hormones and H. pylori infection.
In this study, it was found that H. pylori infection was able to cause acute gastritis in postmenopausal animals (these animals had no natural estrogen or progesterone). This effect was prevented with progesterone treatment.
It also found that H. pylori caused a specific type of gastritis known as follicular gastritis in both pre and postmenopausal animals. This was also prevented by pre-treatment with either estrogen or progesterone.
It was also found that estradiol induced an inflammatory response in the gut and maintained the proliferation of cells that line the stomach, whereas progesterone was anti-inflammatory and had opposing effects on the cells.
Like in other tissues, we see here how estrogen and progesterone have both balancing and opposing functions in the body. More research in particular on humans would need to be conducted before drawing firm conclusions based on this research, but it is fascinating!
Autoimmune Inflammatory Bowel Disease
Not much research has been conducted on progesterone and conditions such as Crohn’s and Ulcerative Colitis. One study did look at 47 premenopausal women with IBD. No specific cycle-related impact was found on stool frequency, IBD symptoms, and need for medication based on the phase of the cycle.
No studies have been completed to my knowledge on providing progesterone therapy in patients with IBD. However, given the systemic impacts of progesterone as an anti-inflammatory compound, this would be an interesting area to study.
Ultimately, progesterone has a significant effect on multiple tissues in the body and likely works in conjunction with estradiol and multiple other factors in order to regulate physiology in the gut.
If a patient is of reproductive age and does not ovulate, consistently ovulates late, or has low levels of this hormone, it is quite possible the function of the gut will be affected.
Gut problems such as IBS, SIBO, gallbladder and biliary disease are common in patients with hormonal concerns like PCOS, and in times of change such as pregnancy, puberty, and perimenopause.
It’s very likely given the body of research we have on hormones and the gut that progesterone plays an important role in these symptoms. Given this complexity, a thorough assessment of both hormonal status and gut function is the clinical starting point for understanding what is driving your symptoms.
If your gut symptoms have not responded to conventional approaches, a hormonal-GI assessment may help clarify what has been missed. At White Lotus Clinic, we can assess your hormonal profile and gut function together, including GI map testing, SIBO breath testing, and H. pylori testing alongside hormone panels, so that nothing falls through the gaps between specialists.
Frequently Asked Questions About Progesterone and Gut Health
Can progesterone cause stomach issues?
Progesterone affects multiple systems in the gut. At normal physiological levels, it supports gut immune health and helps regulate motility. Very high levels of progesterone, such as those in pregnancy, can slow digestion. However, progesterone does not directly cause or treat most common gut symptoms like bloating or constipation. Low progesterone can impact the inflammatory and immune environment that keeps the gut functioning well, which is why individual assessment of both hormonal and GI status is important.
Does progesterone slow digestion?
Research shows that progesterone can moderate gut motility. GI transit time is measurably longer during the luteal phase of the menstrual cycle, when progesterone is dominant. This is a regulatory function; healthy progesterone levels are part of normal digestive rhythm, not a pathological process. Problems tend to emerge at the extremes: very high levels (as in pregnancy) can slow digestion significantly, while very low levels (as in PCOS, anovulatory cycles, or perimenopause) may compromise the gut’s immune and inflammatory regulation.
Does progesterone cause gastritis or stomach ulcers?
Research suggests the opposite. Both progesterone and estrogen are thought to have a protective effect on the stomach lining: promoting healing, activating mucous production, and supporting the cells that line the stomach. In animal studies, progesterone treatment helped prevent H. pylori-related gastritis. However, more research on humans is needed before drawing firm conclusions. If you are experiencing gastritis symptoms alongside hormone health concerns, assessment of both is an important starting point.
Can a naturopathic doctor prescribe progesterone?
Yes. At White Lotus Clinic, our naturopathic doctors prescribe progesterone regularly. We prescribe vaginal progesterone suppositories (which achieve blood levels similar to oral progesterone), compounded progesterone, and progesterone cream. For oral progesterone specifically, we work with partner providers to ensure our patients have access to the form that is right for them. You can learn more about how we use progesterone therapy on our cyclic progesterone therapy page.
Does progesterone cause heartburn or reflux?
Progesterone affects the pressure of the lower esophageal sphincter, which regulates the opening between the esophagus and stomach. However, most studies have found no clinical correlation between progesterone levels and reflux symptoms at normal physiological levels. In pregnancy, extremely high hormone levels combined with increased abdominal pressure may contribute to reflux. There are no human studies on micronized progesterone therapy and reflux specifically. If reflux is a concern alongside hormonal symptoms, assessing both together can help clarify what is contributing.
Can I take antacids or famotidine with progesterone?
Progesterone generally does not interfere with most medications. However, as part of a thorough assessment, we review each patient’s full medication list to check for any potential interactions. This is especially relevant if you are taking multiple medications alongside progesterone therapy.
What is the difference between prescription progesterone and over-the-counter progesterone cream?
Prescription progesterone is clinically dosed and monitored through blood testing to ensure therapeutic levels are reached. Over-the-counter progesterone creams have variable absorption rates and are not monitored. At White Lotus Clinic, we prescribe pharmaceutical-grade progesterone in forms that achieve measurable blood levels. If you have tried over-the-counter progesterone without improvement, a clinical approach with proper testing and dosing may offer a different experience.
What does a first appointment involve?
A first visit begins with a thorough review of your symptoms, health history, and any medications you are currently taking. From there, we determine which testing is appropriate: this may include hormone panels, GI map testing, SIBO breath testing, or H. pylori testing, depending on your situation. The goal of the initial visit is to understand what is happening, not to prescribe a protocol. We start with assessment and build an approach based on what we find. See fees and booking options.
Will naturopathic treatment conflict with what my GP or gastroenterologist is doing?
Our approach is designed to complement your existing care, not replace it. We review all medications you are taking and work alongside your other providers. For oral progesterone, we refer to partner providers; collaborative care is built into how we practice. We add the hormonal lens to the GI picture; we do not ask you to choose between us and your current care team.
How much does a naturopathic appointment cost?
Naturopathic appointments at White Lotus Clinic are often covered in part or in full by extended health insurance plans. For current fees, appointment types, and insurance information, please visit our fees and booking page.
How We Assess the Connection Between Your Hormones and Your Gut
1
Review of symptoms, health history, and medications.
We start by understanding your full clinical picture, including every medication and supplement you are currently taking. We review each one to check for potential interactions, particularly if you are on or considering progesterone therapy.
2
Hormone testing.
Depending on your situation, this may include progesterone, estrogen, insulin, and other relevant hormonal panels. The advantage of our approach is that we can assess hormonal and metabolic status together rather than testing one system at a time.
3
GI-specific testing as indicated.
We can order GI map tests, small intestinal bacterial overgrowth (SIBO) breath tests, H. pylori tests, and other assessments to evaluate gut function directly. These can be run alongside your hormone panels; we can test both systems at once.
4
Interpretation and individualized approach.
We bring the hormonal and GI findings together to build a picture of what is driving your symptoms. Every patient's situation is different, and the approach is built from what the assessment reveals, not from a fixed protocol.
Dr. Fiona McCulloch, ND
Dr. Fiona McCulloch is the founder of White Lotus Clinic and has been in clinical practice for over 25 years. She is a peer reviewer of the 2023 International Evidence-Based PCOS Guidelines, the published author of 8 Steps to Reverse Your PCOS, a Fellow of the American Board of Naturopathic Endocrinology, and a board member of the Endocrinology Association of Naturopathic Physicians (EndoANP). Her clinical focus includes the intersection of hormonal health and gastrointestinal function in patients with PCOS, perimenopause, and related conditions.
Our naturopathic doctors prescribe progesterone regularly, including vaginal progesterone suppositories, compounded progesterone, and progesterone cream. For oral progesterone, we work with partner providers to ensure our patients have access to the form that is right for them.
Moving Beyond Trial-and-Error
Understanding what is driving your gut symptoms, whether that is low progesterone, insulin resistance, or something else entirely, changes the approach from managing symptoms in isolation to addressing root causes together. Instead of cycling through elimination diets and medications that may not be targeting the actual problem, you can work with a clinician who looks at the hormonal and GI picture as one connected system.
If your digestive symptoms are affecting your daily life and conventional approaches have not provided clear answers, a hormonal-GI assessment at White Lotus Clinic can help clarify what has been missed. Dr. Fiona McCulloch and our team assess both your hormonal profile and gut function in the same visit, so you get a complete picture, not a partial one.
Not ready to book? Learn more about cyclic progesterone therapy or our approach to menopause and perimenopause care.
References
- Gonenne J, Esfandyari T, Camilleri M, et al. Effect of female sex hormone supplementation and withdrawal on gastrointestinal and colonic transit in postmenopausal women. Neurogastroenterol Motil. 2006;18(10):911–918.
- Marzio L. Factors affecting gallbladder motility: drugs. Dig Liver Dis. 2003;35(3):17–19.
- Everson GT, McKinley C, Lawson M, et al. Gallbladder function in the human female: effect of the ovulatory cycle, pregnancy, and contraceptive steroids. Gastroenterology. 1982;82(4):711–719.
- Coquoz A, Regli D, Stute P. Impact of progesterone on the gastrointestinal tract: a comprehensive literature review. Climacteric. 2022 Mar 7:1-25.
- Lim SM, Nam CM, Kim YN, et al. The effect of the menstrual cycle on inflammatory bowel disease: a prospective study. Gut Liver. 2013;7(1):51–57.
- Alvarez-Sanchez A, Rey E, Achem SR, et al. Does progesterone fluctuation across the menstrual cycle predispose to gastroesophageal reflux? J Gastroenterol. 1999;94(6):1468–1471.
- Nelson JL III, Richter JE, Johns DN, et al. Esophageal contraction pressures are not affected by normal menstrual cycles. Gastroenterology. 1984;87:876–871.
- Clarrett DM, Hachem C. Gastroesophageal reflux disease (GERD). Mo Med. 2018;115(3):214–218.
- Wald A, Van Thiel DH, Hoechstetter L, Gavaler JS, Egler KM, Verm R, Scott L, Lester R. Gastrointestinal transit: the effect of the menstrual cycle. Gastroenterology. 1981 Jun;80(6):1497-500.
- Zhou Z, Bian C, Luo Z, Guille C, Ogunrinde E, Wu J, Zhao M, Fitting S, Kamen DL, Oates JC, Gilkeson G, Jiang W. Progesterone decreases gut permeability through upregulating occludin expression in primary human gut tissues and Caco-2 cells. Sci Rep. 2019 Jun 10;9(1):8367.
- Saqui-Salces M, Neri-Gomez T, Gamboa-Dominguez A, et al. Estrogen and progesterone receptor isoforms expression in the stomach of Mongolian gerbils. World J Gastroenterol. 2008;14(37):5701–5706.
- Saqui-Salces M, Rocha-Gutierrez BL, Barrios-Payan JA, et al. Effects of estradiol and progesterone on gastric mucosal response to early Helicobacter pylori infection in female gerbils. Helicobacter. 2006;11(2):123–130.
- Marugo M, Molinari F, Fazzuoli L, et al. Estradiol and progesterone receptors in normal and pathologic colonic mucosa in humans. J Endocrinol Invest. 1985;8(2):117–119.
- Wald A, Van Thiel DH, Hoechstetter L, et al. Gastrointestinal transit: the effect of the menstrual cycle. Gastroenterology. 1981;80(6):1497–1500.