Women are significantly more likely than men to experience constipation, with studies finding female-to-male prevalence ratios as high as 3.77 to 1. The reasons go well beyond diet: hormonal fluctuations, pregnancy, pelvic floor changes from childbirth, and anatomical differences all play a role. Understanding which factors apply to you can help you figure out what’s actually going on and what might help.
Hormonal Shifts Across the Menstrual Cycle
Progesterone, one of the two main hormones driving the menstrual cycle, relaxes smooth muscle throughout the body. That includes the muscles lining your intestines. During the luteal phase (the roughly two weeks between ovulation and the start of your period), progesterone levels rise sharply. This slows the rhythmic contractions that push food and waste through your digestive tract, often leading to fewer bowel movements or outright constipation in the days before your period.
Once your period begins, progesterone drops and your body releases prostaglandins, chemicals that trigger uterine contractions. Those same prostaglandins also stimulate your intestines, which is why many women experience the opposite problem (loose stools or urgency) during menstruation. This back-and-forth pattern means constipation can feel cyclical, worsening predictably each month and then resolving on its own.
Pregnancy and Constipation
Up to 40% of women experience constipation at some point during pregnancy. In the early months, the main culprit is hormonal: progesterone surges to sustain the pregnancy, and that same muscle-relaxing effect slows your gut. The fact that constipation is most common in the first and second trimesters, before the uterus is large enough to physically crowd the intestines, supports the idea that hormones are the primary driver rather than the baby’s size.
As pregnancy progresses, mechanical pressure does start to matter. A growing uterus compresses the colon and can physically slow the movement of stool. Iron supplements in prenatal vitamins add another layer. Ferrous sulfate, the most commonly prescribed form of iron, is well known for causing constipation. The combination of high progesterone, physical compression, and iron supplementation makes pregnancy one of the most common settings for constipation in women.
Pelvic Floor Problems After Childbirth
Your pelvic floor is a group of muscles that supports your bladder, uterus, and rectum. To have a normal bowel movement, these muscles need to relax in a coordinated way. When that coordination breaks down, a condition called pelvic floor dyssynergia, the muscles tighten instead of relaxing when you try to go. This creates a sensation of blockage or incomplete evacuation even when stool is ready to pass.
Pregnancy and vaginal delivery are among the most common causes of pelvic floor dysfunction. The pressure of carrying a baby and the stretching or tearing that can occur during birth weaken and sometimes damage these muscles. The result isn’t always immediate. Some women develop symptoms months or years after delivery.
A related condition called a rectocele can also develop. This happens when the wall of tissue separating the rectum from the vagina weakens or tears, allowing the rectum to bulge into the vaginal canal. Stool can get trapped in this bulge, making it difficult to fully empty the bowel. Some women find they need to press against the vaginal wall with their fingers to pass stool. Rectoceles are far more common in women who have had vaginal deliveries, particularly multiple ones.
Menopause Changes Gut Function
During perimenopause and menopause, both estrogen and progesterone decline, but not in a smooth, predictable way. These hormones influence the communication between your brain and gut, the speed of digestion, and even the balance of bacteria in your intestines. As levels drop and fluctuate, many women notice increased bloating, changes in stool consistency, and slower bowel movements. Declining progesterone in particular is linked to sluggish digestion during this stage of life.
The transition can last years, and digestive symptoms often overlap with other menopausal changes like sleep disruption and stress, both of which independently affect gut function. Women who start estrogen therapy for menopausal symptoms may also notice changes in bowel habits, since hormone replacement can influence gut motility in either direction.
IBS With Constipation
Irritable bowel syndrome is more common in women than men, and the constipation-predominant form (IBS-C) is especially prevalent in the female population. IBS-C involves chronic abdominal pain along with infrequent, hard, or difficult-to-pass stools. It’s a functional condition, meaning there’s no visible structural damage, but the gut-brain communication is disrupted.
Estrogen appears to play a role in this imbalance, which may explain why IBS often worsens around menstruation and why estrogen therapy (before or after menopause) is considered a risk factor. Clinically, chronic constipation is defined as having fewer than three spontaneous bowel movements per week, with hard or lumpy stools at least 25% of the time, persisting over several months. If that pattern sounds familiar, it’s worth investigating whether IBS-C is behind it rather than attributing the problem to diet alone.
Diet, Fiber, and Hydration
The USDA recommends 25 grams of fiber daily for women under 50 and 21 grams for women over 50. Most Americans fall well short of these targets, averaging around 15 grams a day. Fiber adds bulk to stool and helps it retain water, making it softer and easier to pass. Without enough of it, stool moves more slowly through the colon, and more water gets absorbed along the way, leaving it hard and difficult to pass.
Hydration matters too, but it’s most impactful when combined with adequate fiber. Drinking more water without increasing fiber intake has limited effect on constipation for most people. The most effective dietary approach is gradually increasing fiber from whole food sources (fruits, vegetables, legumes, whole grains) while drinking enough fluid to support the added bulk. Increasing fiber too quickly can cause gas and bloating, so a gradual ramp-up over a week or two works best.
Medications That Slow Things Down
Several medications that women commonly take can contribute to constipation. Iron supplements, especially the ferrous sulfate found in most prenatal vitamins, are a frequent offender. Calcium supplements, certain antidepressants (particularly older tricyclic types and some SSRIs), antihistamines, and opioid pain medications all slow gut motility. If you started a new medication around the time constipation appeared, the timing is worth noting.
For iron specifically, switching to a different form (like ferrous gluconate or iron bisglycinate) or taking it every other day instead of daily can reduce gut side effects without sacrificing absorption. Your pharmacist or prescriber can help identify alternatives if a medication is clearly contributing to the problem.
Physical Activity and Stress
Regular movement stimulates the natural contractions of your intestines. Sedentary habits slow everything down. Even moderate activity like walking for 20 to 30 minutes a day can meaningfully improve bowel regularity. This is especially relevant for women in desk-based jobs or those whose activity levels have dropped due to pregnancy, injury, or chronic fatigue.
Chronic stress also plays a direct role. The gut and brain communicate constantly through the vagus nerve and shared chemical messengers. Sustained stress can shift your nervous system into a state that prioritizes alertness over digestion, slowing gut transit. Women report higher rates of chronic stress and anxiety than men across most age groups, which may contribute to the overall gender gap in constipation rates. Practices that activate the body’s rest-and-digest mode, like deep breathing, regular sleep, and physical activity, support gut motility alongside their other benefits.