Pain or pressure in your bum during late pregnancy can be a sign of labor, but it’s not always. Rectal pressure is most closely associated with the later phases of active labor, when your baby’s head moves deep into the pelvis and presses against the nerves near your tailbone and rectum. However, several other common pregnancy conditions cause similar pain without labor being anywhere close. The key is understanding what the sensation feels like and what other symptoms come with it.
Why Labor Causes Rectal Pressure
During the final stretch of active labor, contractions come close together and can last 60 to 90 seconds. At this point, the baby’s head is descending through your pelvis, and the intense pressure it puts on surrounding tissue creates a deep ache or bearing-down feeling in your lower back and rectum. Many people describe it as needing to have a bowel movement, even though that’s not what’s happening.
The sensation is driven by a bundle of nerves called the pudendal nerve, which branches from the lower spine and supplies feeling to the rectum, perineum, and genitalia. As your baby’s head passes through the birth canal, it stretches and compresses these nerve branches directly. That’s why the pressure can feel so specific to your bum rather than your abdomen.
Back Labor Makes It More Intense
If your baby is facing your abdomen instead of your spine (called the occiput posterior position), the back of their skull presses directly against your lower spine and tailbone during contractions. This is commonly known as “back labor,” and it amplifies rectal and lower back pain significantly. The pain tends to be constant between contractions rather than coming and going, and it concentrates in a band across your lower back that wraps around toward your rectum.
Back labor doesn’t mean something is wrong. Many babies rotate on their own during labor. But if you’re feeling sharp, persistent pain in your bum and lower back, especially alongside regular contractions, the baby’s position may be contributing.
How to Tell It’s Labor and Not Something Else
Rectal pressure from labor almost never shows up on its own. It comes with other unmistakable signs:
- Regular contractions that get closer together, longer, and more intense over time
- A feeling of downward pressure in your pelvis, not just your rectum
- Possible rupture of membranes (your water breaking)
- Cervical changes that your midwife or doctor can confirm
If you’re having rectal pain without contractions, or the pain is there all the time regardless of what you’re doing, it’s more likely caused by one of the common pregnancy-related conditions below.
Other Causes of Bum Pain in Pregnancy
More than 60% of pregnant women experience constipation, driven by hormonal changes, reduced physical activity, and iron supplements. Straining from constipation puts direct pressure on the rectum and anus, and it’s one of the most common reasons for anal pain during pregnancy, period.
Hemorrhoids are the next major culprit. Your growing uterus, increased blood volume, and elevated pressure in pelvic veins all cause blood to pool in the veins around your rectum. This can lead to swollen, painful hemorrhoids that burn, itch, or throb. About 8% of women develop symptomatic hemorrhoids in the third trimester alone, and the number jumps to over 20% after delivery. If you notice a firm, tender lump near your anus, that’s likely a perianal thrombosis (a clot in one of these swollen veins), which is particularly common in the third trimester.
Anal fissures, small tears in the lining of the anus, are the second most common rectal condition in pregnancy after hemorrhoids. They’re usually caused by passing hard stools and produce a sharp, stinging pain during and after bowel movements. Unlike labor-related pressure, fissure pain has a clear connection to using the bathroom.
What Labor-Related Rectal Pressure Feels Like
Women who’ve been through it often compare it to an overwhelming urge to push, similar to the sensation before a large bowel movement but far more intense and deeper. It builds with each contraction and eases slightly between them (unless you’re dealing with back labor, where it can stay constant). The pressure typically starts once the baby’s head is low enough in the pelvis to bear down on the pelvic floor, which usually means you’re well into active labor or approaching the pushing stage.
By contrast, hemorrhoid pain tends to be superficial, burning, or throbbing. Constipation pain is crampy and tied to bowel activity. Pelvic girdle pain, another late-pregnancy complaint, aches across the front or back of the pelvis but doesn’t usually concentrate in the rectum itself. These distinctions matter because they help you figure out whether what you’re feeling is your body gearing up for birth or simply one of the uncomfortable realities of the third trimester.
Timing and What to Watch For
Rectal pressure as an early labor sign is uncommon. It typically appears during the transition phase of active labor, when you’re nearing full dilation. If you’re at home and suddenly feel intense rectal pressure alongside strong, rhythmic contractions that are coming every few minutes, labor is likely progressing quickly. This is especially worth paying attention to if it’s not your first baby, since subsequent labors often move faster.
If you’re experiencing milder, intermittent rectal pressure without contractions in the weeks leading up to your due date, it may be your baby “dropping” lower into your pelvis (called lightening). This repositioning relieves pressure on your lungs and ribs but adds it to your bladder, rectum, and pelvic floor. It’s a normal part of your body preparing for labor, not a sign that labor is imminent. First-time mothers often experience lightening two to four weeks before delivery, while those who’ve given birth before may not notice it until labor itself begins.