How Menopause Affects Gut Health and Bloating

A jellyfish has no brain behind its eyes. And yet it decides things. It swims toward food and away from danger. It does this with a nerve net concentrated in its gut, a kind of original brain that predates the one later species grew inside a skull. Humans kept a version of that system. It sits in the lining of the digestive tract, and it runs on roughly 500 million nerve cells, more than live in the entire human spinal cord (63:03). Gastroenterologist Trisha Pasricha, a physician-scientist at Beth Israel Deaconess Medical Center and assistant professor at Harvard Medical School, calls this the enteric nervous system, and she has spent her career arguing that most of medicine still treats it like plumbing.

That argument is the spine of her conversation with Dr. Mary Claire Haver, an OB-GYN and certified menopause practitioner, on the podcast unPAUSED. Pasricha is also the author of a book called You've Been Pooping All Wrong, and she writes the Ask a Doctor column for the Washington Post. Her specialty, neurogastroenterology, studies how the gut and the brain talk to each other, and for over a century the assumption was that the brain did most of the talking, sending stress down into an unhappy stomach. Pasricha's research points the other way. Roughly 80 percent of the traffic on the vagus nerve, the long cranial nerve that links gut to brain, runs from the gut upward (60:59). The butterflies are not imaginary. They are data arriving from below.

This matters for a very practical reason. For decades, women who told doctors their digestion had fallen apart in midlife were handed the same diagnosis: stress, age, it's in your head. Haver has heard it from a thousand women. Pasricha's rebuttal doubles as the episode's thesis.

"It's not the stress causing the symptoms, it's the symptoms causing the stress." — Trisha Pasricha [00:24]

Irritable bowel syndrome, or IBS, a condition defined by pain and altered bowel habits with no abnormal test to point to, affects 10 to 15 percent of Americans, and it is roughly twice as common in women as in men (09:23). Pasricha's explanation is biological, not psychological. Estrogen receptors sit inside the nervous system of the gut itself.

The Pain Switch Called Estrogen

Estrogen does two separate jobs in the digestive tract, and they can pull in opposite directions. First, it slows things down. Women on hormone replacement therapy sometimes notice their stomach empties more slowly and their gut gets a little more sluggish, a direct effect of estrogen on motility, the speed at which food and waste move through the system (21:44). Second, and more surprising, estrogen turns up the volume on pain. It stimulates serotonin-producing cells in the gut lining, which send signals up sensory nerves telling the brain "we are in pain." In mouse studies, removing the ovaries dulls that gut pain signal; injecting estrogen back in restores it (22:53). That is the biological reason IBS skews female and skews younger: more circulating estrogen means a gut primed to report pain. As estrogen falls after menopause, that particular signal often quiets down, even though changes happening in the brain's own estrogen receptors can sometimes override the improvement, which is why some postmenopausal IBS patients report symptoms as severe as ever (24:28).

Running underneath all of this is something called the estrobolome, a term for the specific gut bacteria that can chemically modify estrogen after the liver has tagged it for excretion. Those bacteria strip the tag off, letting some estrogen get reabsorbed into the body rather than leaving in stool (20:01). It is, Pasricha says, an emerging field, with no settled answer yet on why some people host more of these bacteria than others or what it ultimately means for health (20:42). What is firmer is the downstream list of changes menopause brings: accidental bowel leakage, which clinicians call fecal incontinence, affects postmenopausal women an average of one to two times a month (10:39), a number so common Pasricha wants it said out loud rather than hidden in shame. Bloating has at least three distinct biological roots, she says: diet, subtle changes in bowel habits, and a frequently missed culprit called abdominophrenic dyssynergia, in which the abdominal wall and diaphragm muscles stop coordinating and simply push the belly outward with nothing new actually inside it (15:45).

What the Checklist Actually Looks Like

Pasricha's prescriptions are concrete. For fecal incontinence, she points to psyllium husk, a soluble fiber studied in Harvard's Nurses' Health Study, which bulks the stool and appears to heighten sensitivity near the sphincter so the body recognizes an incoming bowel movement in time to respond (13:42). For hemorrhoids, which worsen with age and childbirth, she recommends keeping bathroom visits under five minutes and leaving the phone outside, since her own lab's research found smartphone use on the toilet raises hemorrhoid risk, likely because people simply sit longer (34:10). For hygiene, she is blunt about her preference.

"I'm Team Bidet. I'm Team Bidet all the way." — Trisha Pasricha [28:44]

Her reasoning: toilet paper is abrasive, and the perianal tissue, the skin around the anus, thins with age the same way vaginal tissue does during menopause, so repeated wiping causes small, accumulating injuries.

On medication for slow bowels, Pasricha pushes back against stigma directly, comparing laxative use to insulin for diabetes: a tool to use without shame when needed, paired with a doctor's judgment about whether something underlying is being missed (26:22). For iron deficiency anemia, a common but under-investigated symptom in women, her message is pointed: doctors too often blame periods by default, but the condition should be worked up as a possible GI issue, including a colonoscopy and upper endoscopy when no clear cause is found (43:46). She also offers a small fix for a common complaint: oral iron supplements can be taken every other day rather than daily, delivering similar absorption with fewer GI side effects (49:46).

The clearest number in the whole conversation concerns colon cancer screening. Average-risk adults should start colonoscopies at 45, not 50, under newer guidelines (53:05). The reason a colonoscopy matters more than other screening options, Pasricha argues, is that it is the only test that prevents the cancer rather than just detecting it: doctors go in looking for polyps, precancerous growths, and remove them on the spot, which matters because 5 to 10 percent of untreated polyps become cancerous over time (53:45). She also names four red flags tied to a sixfold higher risk of early-onset colorectal cancer when three or four appear together: rectal bleeding, abdominal pain, a change in bowel habits, and unexplained iron deficiency anemia (39:19). None of these, she stresses, needs to be dramatic to be worth a message to a doctor.

On diet, her numbers are simple and discouraging: the average American woman eats 10 to 12 grams of fiber a day (66:20), against a target of 25 grams for women under 50 and 21 grams for women over 50 (67:26). Her framing of why fiber matters is the kind of line that resets how people think about food.

"Fiber is not for you. Fiber is for your microbes." — Trisha Pasricha [66:38]

A Stanford trial she cites found that people who added fermented foods, not supplements but foods like yogurt, kimchi, and sauerkraut, saw 19 different inflammatory proteins in their blood drop within 10 weeks (69:11). Ultra-processed foods work in the opposite direction: emulsifiers in them thin the gut's protective mucus barrier and trigger local inflammation, and roughly 60 percent of the average American diet now comes from these foods (76:03).

Toward the end, Haver asks for one closing idea. Pasricha returns to where she started: stop treating the gut like a trash can and start treating it like the second brain it is. New, persistent bloating in a postmenopausal woman, she adds, is not a symptom to wait out, since ovarian cancer has no reliable screening test and tends to announce itself first through vague gastrointestinal complaints (81:29). The gut, in other words, has been trying to send a signal for a long time. The science is only now catching up to translate it.