Contractions are the rhythmic tightening and releasing of your uterine muscles. They serve different purposes at different stages of pregnancy: some are your body’s way of practicing for delivery, others open your cervix and push your baby out, and a final round after birth shrinks your uterus back to its original size. Not all contractions mean labor is starting, and learning to tell the difference is one of the most practical skills you can pick up before your due date.
How Contractions Work
Your uterus is a large muscle, and contractions happen when it tightens and then relaxes. The process is driven by hormones. Oxytocin binds to receptors on the uterine muscle, triggering the muscle fibers to shorten and squeeze. Oxytocin also stimulates the release of prostaglandins, a second group of hormones that soften and thin your cervix while adding to the contracting force. During true labor, these two hormones work together in a feedback loop: contractions increase oxytocin, which increases contractions, building in strength until delivery.
Braxton Hicks: Practice Contractions
Braxton Hicks contractions can start as early as the second trimester, though many people first notice them in the third. They feel like a general tightening across your abdomen, similar to mild menstrual cramps. The key feature is that they stay irregular. They don’t get stronger over time, they don’t get closer together, and they don’t open your cervix. You can still talk and walk through them comfortably.
Certain things tend to trigger Braxton Hicks: dehydration, physical activity, a full bladder, sex, or lifting something heavy. They also tend to stop when you change positions or take a walk. If you drink a glass of water and rest for a few minutes and the tightening fades, you’re almost certainly dealing with Braxton Hicks rather than real labor.
Prodromal Labor
Prodromal labor sits in an annoying middle ground between Braxton Hicks and true labor. The contractions can be mildly painful, come as often as every five minutes, and last about 60 seconds each. That pattern looks a lot like early labor on paper, which is why it’s sometimes called “false labor.” The difference is that prodromal labor never advances beyond that point. The contractions don’t get stronger or closer together, and they don’t cause your cervix to dilate or thin. There’s no evidence that prodromal labor speeds up the start of real labor, either. It can last hours or even recur over several days, which is exhausting but not dangerous.
What True Labor Contractions Feel Like
True labor contractions are distinct from practice contractions in a few reliable ways. They come at regular intervals and gradually get both stronger and closer together. Each contraction typically lasts between 30 and 90 seconds. Walking or shifting positions doesn’t make them stop. As labor progresses, talking through a contraction becomes difficult, then impossible.
Many people describe early labor contractions as strong menstrual cramps centered low in the abdomen or lower back. As labor intensifies, the sensation often wraps around from the back to the front and becomes more of a deep, building pressure. The pain peaks partway through each contraction and then eases as the muscle relaxes, giving you a break before the next one.
Stages of Labor and Contraction Patterns
Early labor is the longest phase, typically lasting 6 to 12 hours for a first baby. During this stage, your cervix dilates to about 6 centimeters. Contractions may start 15 to 20 minutes apart and gradually move closer together. Once they’re coming every five minutes and lasting at least 45 to 60 seconds over a one-hour period, it’s time to call your provider or head to the hospital.
Active labor picks up from there, lasting roughly 4 to 8 hours. Your cervix dilates from 6 to 10 centimeters. Contractions are strong, regularly spaced about 3 to 5 minutes apart, and you may begin to feel the urge to push as you approach full dilation. This is the most intense part of labor, and it’s when many people decide to use pain management if they haven’t already.
When to Go to the Hospital
The general guideline for first-time parents is to head to the hospital when contractions are coming every 3 to 5 minutes, each lasting at least 45 to 60 seconds, sustained over an hour. If you’ve given birth before, the threshold is a bit more relaxed: contractions every 5 to 7 minutes lasting at least 45 to 60 seconds, because labor tends to progress faster with subsequent births.
To time contractions accurately, measure from the start of one contraction to the start of the next. If the tightening lasts 30 seconds or longer, you’re likely experiencing labor contractions rather than Braxton Hicks. Many people find it helpful to use a contraction-timing app so they can focus on coping rather than watching a clock.
Preterm Contractions
Some uterine tightening throughout the day is normal at any point in pregnancy. What’s not normal is frequent contractions before 37 weeks. The National Institute of Child Health and Human Development defines the warning threshold as six or more contractions in one hour. Preterm labor, which can occur anytime from 20 through 36 weeks, may also include a change in vaginal discharge or fluid leaking, pelvic pressure, a low dull backache, or cramps that feel like period pain with or without diarrhea. Contractions coming every 10 minutes or more often alongside any of these symptoms warrant immediate medical attention, because frequent tightening can start to open the cervix too early.
Contractions After Birth
Contractions don’t stop the moment your baby arrives. In the hours and days after delivery, your uterus continues to contract in order to shrink back to its pre-pregnancy size and cut off blood flow to the spot where the placenta was attached. This process, called involution, is your body’s primary defense against excessive postpartum bleeding.
These afterpains are typically noticeable for just a few days. They can feel like intense cramping lasting about five minutes before gradually easing. Breastfeeding or pumping makes them stronger because your baby’s suckling triggers a fresh release of oxytocin, which is the same hormone that drives labor contractions. The cramping during feeding can catch new parents off guard, but it’s a sign that your uterus is recovering efficiently.
Managing Contraction Pain
Beyond epidurals and other medical pain relief, several non-drug techniques can meaningfully reduce how intense contractions feel. The American College of Obstetricians and Gynecologists highlights massage, water therapy (a warm shower or birth pool), and breathing exercises as common coping tools. Taking short walks and changing positions during labor also helps. Simply shifting from lying on your back to hands and knees, sitting on a birth ball, or swaying while standing can reduce pain and sometimes help labor progress.
These techniques tend to be most effective when you’ve practiced them before labor starts. Childbirth education classes, whether in person or online, give you a chance to rehearse breathing patterns and positioning with a partner so they feel familiar when contractions are demanding your full attention.