Spotting during a bowel movement in pregnancy is overwhelmingly caused by hemorrhoids or anal fissures, both of which become far more common as pregnancy progresses. The straining, constipation, and increased blood volume that come with carrying a baby create near-perfect conditions for these minor but alarming bleeds. That said, the blood you notice is not always rectal. Straining on the toilet can also trigger vaginal spotting from a sensitive cervix, which means figuring out where the blood is actually coming from matters more than you might expect.
The Most Common Culprit Is Rectal, Not Obstetric
When researchers review cases of lower gastrointestinal bleeding during pregnancy, the majority trace back to hemorrhoids and anal fissures.1PubMed Central. Lower gastrointestinal bleeding in pregnancy: Differential diagnosis, assessment and management Hemorrhoids are swollen veins in the rectal area that can bleed when you pass a stool, and anal fissures are small tears in the lining of the anus, usually caused by hard or large bowel movements. Both conditions produce bright red blood that you see on toilet paper, in the bowl, or on the surface of the stool itself.
A key detail that often gets lost in the anxiety of the moment: hemorrhoids and fissures are not a threat to your pregnancy. They are uncomfortable and can look frightening, especially if you are not used to seeing blood when you wipe, but they are localized injuries to the tissue around the anus. The blood is not coming from your uterus, your placenta, or anywhere near your baby. One clinical review aimed at family physicians described a scenario nearly identical to this article’s title: a patient in the third trimester of her first pregnancy with spotting during bowel movements, found to have hemorrhoids, and managed entirely with dietary fiber, stool softeners, and increased fluid intake.2PubMed Central. Hemorrhoids in pregnancy
Why Pregnancy Sets You Up for Rectal Bleeding
Pregnancy changes your digestive system in ways that stack the deck in favor of constipation, straining, and eventually bleeding. The chain of events starts with your hormones and ends with mechanical pressure from the growing uterus.
Progesterone, which rises steadily throughout pregnancy, relaxes smooth muscle throughout the body. That includes the smooth muscle lining your intestines. Research shows that progesterone slows gut transit by boosting nitric oxide production in smooth muscle cells and by suppressing the signaling pathways that normally trigger contraction.3PubMed Central. Progesterone inhibitory role on gastrointestinal motility A separate study found that progesterone interferes with calcium signaling inside smooth muscle cells, which is one of the mechanisms behind slower intestinal transit.4PubMed. Gastrointestinal motility in pregnancy The practical result: food moves through your gut more slowly, water gets absorbed from stool for longer, and you end up constipated.
In some women, the effect goes beyond ordinary constipation. Research into chronic slow-transit constipation in women has found that the problem can involve changes at the receptor level, where contractile proteins in the colon are suppressed while inhibitory proteins are amplified, likely driven by overexpression of progesterone receptors.5Gastroenterology. Role of progesterone signaling in the regulation of G-protein levels in female chronic constipation This helps explain why some pregnant women struggle with severe constipation even when they are doing everything right with fiber and water.
On top of the hormonal slowdown, the growing uterus physically compresses the pelvic veins. Blood flow through the ovarian veins can increase dramatically during pregnancy, and the pressure of the uterus on these vessels impairs venous return from the lower body.6PubMed Central. Comprehensive overview of the venous disorder known as pelvic congestion syndrome The veins around the rectum are part of this same drainage system. When pressure backs up, those veins engorge. Combine that with the straining of constipation, and you have the recipe for hemorrhoids that bleed on contact with hard stool.
When the Spotting Is Actually Vaginal
Here is where things get a little more complicated. When you bear down during a bowel movement, you also increase pressure on the vaginal canal and cervix. If your cervix is more fragile than usual, which is common in pregnancy due to increased blood supply, that straining can cause light vaginal bleeding. You might notice it on toilet paper and assume it came from the same place as the stool, when in fact it came from the vagina.
Cervical polyps are one potential source of this kind of bleeding. These are typically small, benign growths on the cervix that are often present without symptoms, but pregnancy can make them more prone to bleeding. In one documented case, a woman at 23 weeks of gestation presented with sudden vaginal bleeding that turned out to be caused by a cervical polyp. It was removed, and the pregnancy continued to term without further issues.7PubMed Central. Endocervical Polyp as a Cause of Genital Bleeding in the Second Half of Pregnancy: A Case Report Another common source is the cervix itself. During pregnancy, the cervix develops more blood vessels and becomes softer, a process sometimes called cervical ectropion. This makes it bleed more easily from minor irritation, including the intra-abdominal pressure that comes with bearing down on the toilet.
The confusion between vaginal and rectal blood is understandable. Both end up in the same general area, and during a bowel movement you are not in a position to perform a careful anatomical assessment. If you are unsure, one practical approach is to insert a panty liner or a small piece of toilet tissue at the vaginal opening before your next bowel movement. If blood appears on the liner, it is vaginal. If the liner stays clean but you see blood in the toilet or when you wipe from behind, it is rectal. Your provider can also help distinguish the two with a quick exam.
How to Manage Hemorrhoids and Prevent the Bleeding
Because the vast majority of spotting during bowel movements in pregnancy traces back to hemorrhoids and fissures, management focuses on two goals: soften the stool so it does not damage fragile tissue, and reduce the engorgement of the hemorrhoids themselves.
The first line of treatment is straightforward: more fiber, more fluids, and more movement. Clinical guidance consistently recommends increasing dietary fiber and fluid intake as the safest initial approach for pregnant women with constipation.8PubMed Central. Treating constipation during pregnancy Prebiotic fiber sources and increased water intake are specifically preferred because they are not systemically absorbed and pose no known risk to the pregnancy.9Russian Journal of Woman and Child Health. An integrative approach to constipation during pregnancy: stasis, microbiota, metabolites, and the role of dietary fiber
When fiber and fluids alone are not enough, stool softeners and laxatives are considered safe options. Bulk-forming agents, osmotic laxatives, lubricant laxatives, and stimulant laxatives all have minimal systemic absorption, so they are not expected to increase the risk of birth defects.8PubMed Central. Treating constipation during pregnancy Stool softeners and fiber supplements are widely regarded as safe for use in pregnancy, and moderate use of laxatives is also considered acceptable.10Ewha Medical Journal. Treatment of Hemorrhoid in Unusual Condition-Pregnancy
For the hemorrhoids themselves, treatment during pregnancy is mainly symptomatic. Topical creams and ointments that contain a combination of local anesthetics, corticosteroids, and anti-inflammatory agents are commonly used, and although none have been formally evaluated for safety in pregnancy, their constituent ingredients are unlikely to harm the baby in the third trimester.2PubMed Central. Hemorrhoids in pregnancy That said, the same review notes that topical treatments and oral vein-toning medications should be used cautiously because evidence on their safety and effectiveness during pregnancy remains limited.10Ewha Medical Journal. Treatment of Hemorrhoid in Unusual Condition-Pregnancy
Warm sitz baths, where you sit in a few inches of warm water for 10 to 15 minutes, can help shrink hemorrhoids and soothe fissures. Avoiding prolonged sitting on the toilet, not straining beyond what is necessary, and cleaning gently with unscented wipes instead of dry toilet paper all reduce irritation.
Toilet Posture and Straining
How you sit on the toilet can influence how much pressure you generate in your abdomen and pelvic floor. Research into toilet posture suggests that leaning forward with your legs supported can passively increase intra-abdominal pressure while helping the pelvic floor relax, which may reduce the need for active straining.11PubMed Central. Sitting vs. squatting: a scoping review of toilet postures and associated health outcomes A small footstool placed in front of the toilet, raising your knees above your hips, mimics a squatting position and can make bowel movements easier to pass. For pregnant women dealing with hemorrhoids, this is a small change that can meaningfully cut down on the straining that triggers bleeding.
It also helps to go when you first feel the urge rather than holding it. Delaying bowel movements allows the stool to lose more water and become harder, which means more straining when you eventually do go. During pregnancy, when your gut is already moving slowly, waiting too long compounds the problem.
When Rectal Bleeding Could Signal Something More Serious
While hemorrhoids and fissures account for the majority of cases, rectal bleeding during pregnancy can occasionally point to something more serious. Inflammatory bowel disease, including Crohn’s disease and ulcerative colitis, can flare during pregnancy and present with bloody stools. Rarely, colorectal growths or other significant gastrointestinal conditions may be responsible.1PubMed Central. Lower gastrointestinal bleeding in pregnancy: Differential diagnosis, assessment and management
Clinicians reviewing this topic stress that most investigations used to evaluate rectal bleeding are safe during pregnancy and should not be withheld, because missing a serious diagnosis has real implications for both maternal and fetal health.1PubMed Central. Lower gastrointestinal bleeding in pregnancy: Differential diagnosis, assessment and management In practical terms, this means you should not assume that all rectal bleeding during pregnancy is “just hemorrhoids” without at least mentioning it to your provider, especially if:
- The bleeding is heavy: soaking through a pad rather than just a few drops or streaks on toilet paper.
- It persists for days: occasional spotting with straining is typical hemorrhoid behavior, but daily or worsening bleeding warrants attention.
- You have other symptoms: abdominal pain, diarrhea, mucus in the stool, fever, or unexplained weight loss alongside rectal bleeding raises the likelihood of something beyond hemorrhoids.
- The blood is dark: bright red blood on the surface of the stool or on the tissue usually indicates a source near the anus. Dark or tarry stools suggest bleeding from higher in the digestive tract, which is a different and more urgent situation.
If the bleeding is vaginal rather than rectal, the calculus shifts. Vaginal spotting triggered by straining on the toilet is common and often benign during pregnancy, but vaginal bleeding always merits a conversation with your obstetric provider to rule out cervical or placental issues, especially in the second and third trimesters.
The Emotional Weight of Bleeding During Pregnancy
Even when the cause is something as mundane as a hemorrhoid, seeing blood during pregnancy is deeply unsettling. Your mind goes to the worst-case scenario before you have time to think it through, and the anxiety does not necessarily dissolve even after you learn the cause is benign.
Research bears this out. A large study examining depression, anxiety, and stress in pregnant women found that vaginal bleeding during pregnancy was significantly associated with higher rates of all three. Women who reported vaginal bleeding had roughly 30 to 50 percent higher odds of depression, anxiety, and stress symptoms compared to those who did not.12PubMed Central. Depression, anxiety, and stress symptoms in pregnant women before and during the COVID-19 pandemic That study focused on vaginal bleeding specifically, but the psychological pattern likely extends to any bleeding that a pregnant person perceives as potentially related to the pregnancy. The fear response does not wait for a diagnosis.
If you find yourself spiraling after noticing blood during a bowel movement, know that this reaction is normal and shared by many pregnant people. Getting a clear answer from your provider about whether the blood is rectal or vaginal can help break the cycle of worry. For rectal bleeding from hemorrhoids, the reassurance that it has nothing to do with the health of your pregnancy is often the most important part of the treatment.
Why the Problem Often Gets Worse Before It Gets Better
If you are in the second trimester and already dealing with hemorrhoid bleeding, it is worth knowing that the third trimester tends to intensify the problem. The uterus is at its heaviest, placing maximum pressure on the pelvic veins. Constipation often worsens as well, partly because progesterone levels are still climbing and partly because many women become less physically active in the final weeks. The combination of bigger hemorrhoids, harder stools, and more straining means that spotting during bowel movements often peaks in the weeks before delivery.
Labor itself, particularly prolonged pushing during vaginal delivery, can aggravate hemorrhoids further. Many women notice the worst hemorrhoid symptoms in the first few days postpartum. The good news is that hemorrhoids that develop during pregnancy usually improve significantly in the weeks after delivery, once the hormonal changes reverse and the mechanical pressure from the uterus is gone. The veins shrink, the tissue heals, and for most women the bleeding stops entirely without any surgical intervention. If hemorrhoids persist beyond a few months postpartum, that is when more aggressive treatment options like rubber band ligation or other procedures might be discussed, but the vast majority resolve on their own.
In the meantime, staying ahead of constipation from early in pregnancy rather than waiting until hemorrhoids appear is the most effective preventive strategy. Fiber-rich foods, adequate water, regular walking, and a stool softener if needed can keep stools soft enough to pass without the kind of straining that damages rectal veins. It is one of those situations where prevention is genuinely easier than treatment.