Braxton Hicks contractions are irregular tightening episodes of the uterus during pregnancy that are sometimes called “false labor” or “practice contractions.” They actually begin as early as 6 weeks into pregnancy, but most women don’t feel them until the second or third trimester. They’re a normal part of pregnancy, not a sign that labor is starting, and they don’t cause the cervical changes that true labor contractions do.
When They Start and What They Feel Like
Your uterus begins contracting sporadically from very early in pregnancy, around 6 weeks gestation. Most women first notice these contractions in the third trimester, though some become aware of them during the second trimester. The sensation is a tightening or hardening across the front of your belly that lasts anywhere from 30 seconds to about two minutes, then releases on its own.
For many women, Braxton Hicks are painless. You might simply notice your abdomen feels firm when you put your hand on it. When they are uncomfortable, the feeling is similar to mild menstrual cramps concentrated in the front of the belly. You won’t feel pain radiating into your lower back or hips, which is one of the clearest ways to distinguish them from real labor.
Why They Happen
The uterus is made of smooth muscle cells packed with contractile fibers. When calcium floods into these muscle cells, it triggers a chain reaction: the calcium binds to a protein called calmodulin, which activates an enzyme that causes the muscle fibers to grip onto each other and shorten. That shortening is what you feel as a contraction. In Braxton Hicks, this process happens in short, disorganized bursts rather than the coordinated, rhythmic waves of true labor.
As pregnancy progresses and the uterus stretches to accommodate a growing baby, the physical tension on the muscle cells allows more calcium and sodium to flow in, making contractions easier to trigger. This is why Braxton Hicks tend to become more noticeable in the later months.
Common Triggers
Several everyday situations can set off a round of Braxton Hicks:
- Dehydration. When your body is low on fluids, the uterine muscle is more likely to contract. This is one of the most common and most preventable triggers.
- Physical activity or exercise. Movement and exertion can stimulate the uterus, especially in the third trimester.
- Sexual intercourse. Physical stimulation of the uterus can prompt contractions afterward.
- A full bladder. The pressure of a full bladder against the uterus can trigger tightening.
- Prolonged standing or sitting. Staying in one position for a long stretch makes contractions more likely.
Braxton Hicks vs. True Labor
The biggest difference is pattern. Braxton Hicks come and go at random intervals with no consistent rhythm. True labor contractions develop a steady, predictable pattern, coming closer together and lasting longer as time goes on. If you’re timing contractions and they’re five minutes apart or less for an hour, and each one lasts 30 to 70 seconds, that’s more consistent with real labor.
Pain is the other major distinction. Braxton Hicks range from painless to mildly uncomfortable. True labor contractions hurt, and the pain intensifies with each one. Labor pain also spreads, moving from the lower back and hips through the pelvis and abdomen. Braxton Hicks stay in the front of the belly.
Perhaps the most practical test: Braxton Hicks respond to simple interventions. Changing position, drinking water, or taking a short walk will usually cause them to fade. True labor contractions persist regardless of what you do. Nothing makes them lessen or disappear.
How to Get Relief
Because Braxton Hicks respond well to basic changes, a few simple strategies can help when they become bothersome:
- Drink water. Dehydration is such a reliable trigger that simply rehydrating often stops the contractions within minutes.
- Change positions. If you’ve been standing, sit or lie down. If you’ve been sitting a long time, get up and walk around. Aim to shift positions at least every 30 minutes.
- Take a warm bath. Warm water relaxes the uterine muscle and can ease tension quickly.
- Go for a short walk. Light movement helps, especially if you’ve been sedentary.
- Apply a heating pad. Gentle warmth on the lower abdomen can relieve the cramping sensation.
What Braxton Hicks Don’t Do
Braxton Hicks contractions do not dilate or thin the cervix. This is the defining clinical difference between false and true labor. In real labor, each contraction physically opens and thins the cervix to prepare for delivery. Braxton Hicks produce tightening without this progressive change, which is why they’re considered “practice” contractions rather than productive ones.
They also don’t increase in intensity over time the way labor does. A Braxton Hicks contraction at 8 p.m. won’t be stronger than the one at 7 p.m. If you notice contractions that are clearly getting more painful and closer together, especially before 37 weeks, that’s worth a call to your provider since it could indicate preterm labor rather than false labor. After 37 weeks, consistent, intensifying contractions with back pain are a good sign that the real thing has started.