Somewhere around the third trimester your bump goes hard, holds for half a minute and lets go again. The question that follows is always the same, and it is the reason this page exists: was that a contraction, and does it count? Practice contractions and early labour genuinely feel similar, and no single tightening can tell you which one you just had.
What separates them is not how one contraction feels but what a whole hour of them does. This guide covers what Braxton Hicks are and why the uterus bothers, the six differences that reliably separate them from real labour, the twenty-minute test that resolves most cases at home, how to time a contraction the way your midwife means, and the tightenings that need a phone call today rather than an hour of waiting.
The short answer. Braxton Hicks contractions are irregular, unpredictable tightenings of the uterus that do not open the cervix. They last anywhere from under 30 seconds to about 2 minutes, they do not grow longer or stronger over time, and they usually ease within twenty minutes if you drink water, empty your bladder and change position. Real labour contractions become longer, stronger and closer together regardless of what you do, and they do not stop.
What Braxton Hicks Contractions Actually Are
The uterus is a muscle, and it does not wait until labour to start using itself. Contractions of this kind are thought to begin around 6 weeks of gestation — long before anyone could feel them — and are believed to tone the uterine muscle in preparation for birth and to help blood flow through the placenta. They are named after John Braxton Hicks, the English doctor who described them in the nineteenth century, which is why the eponym stuck to something every pregnant uterus does.
Most women first notice them in the second or third trimester. They tend to get more frequent as term approaches, which is exactly when they become hardest to interpret, because that is also when real labour is plausible.
The one thing they do not do is open the cervix. That is not a detail — it is the entire clinical difference. A contraction that does not change the cervix is not labour, however convincing it feels.
What They Feel Like
The usual description is a tightening rather than a pain: the bump hardens across the front, holds, then softens. Put a hand on it and you can feel the difference. Some women feel mild period-like cramping with it; many feel nothing at all and only notice the hardness.
They are typically described as uncomfortable rather than painful. Discomfort that stops you mid-sentence is a different thing, and belongs in the timing exercise below rather than in this paragraph.
The Six Differences That Settle It
Read this table down the rows rather than across. One row rarely decides anything; four or five pointing the same way usually does.
| Braxton Hicks | Real labour | |
|---|---|---|
| Rhythm | Irregular and unpredictable — 10 minutes, then 40, then 3 | Regular, and the gaps shorten steadily |
| Length | Varies each time, from under 30 seconds to about 2 minutes | Settles into a consistent length and grows |
| Intensity | Stays flat or fades over the hour | Builds, hour on hour |
| Where you feel it | Front of the bump, localised | Usually starts in the lower back and wraps round to the front |
| Response to movement | Eases with rest, water, a warm bath or changing position | Carries on regardless of what you try |
| Effect on the cervix | None | Opens and thins it |
Only the last row is decisive, and only a midwife can check it. Everything above it is what you can assess yourself at 3 a.m., which is why the pattern over an hour matters more than any single tightening.
What Sets Them Off
Practice contractions usually have a trigger, and recognising yours is genuinely useful — it turns an alarming event into a predictable one:
- Dehydration — the most common and the easiest to fix.
- A full bladder — an irritable uterus sits directly above it.
- Physical activity — a long walk, a busy day, lifting something heavy.
- Sexual activity — normal, and not a reason to avoid it in an uncomplicated pregnancy.
- The baby moving vigorously, or someone pressing on the bump.
- Tiredness — they are reliably worse in the evening.
If your tightenings consistently follow one of these and settle afterwards, you have your explanation. If they arrive out of nowhere and keep coming, move on to the timing.
The Twenty-Minute Test
Most uncertainty resolves itself with three changes, because every one of them removes a common trigger. Real labour ignores all three.
Try these, then reassess
- Drink a large glass of water and keep drinking
- Empty your bladder
- Change what you were doing — lie on your left side if you were up, walk if you were lying still
- Have a warm (not hot) bath or shower
- Slow your breathing deliberately for a few minutes
- Eat something light if it has been a while
Tightenings that fade over the next twenty minutes were practice contractions. Tightenings that keep their rhythm — or tighten it — deserve a full hour of timing, and then a phone call.
How to Time a Contraction Properly
Almost everyone times them wrong the first time, and the error changes the answer. The interval your midwife wants is measured from the start of one contraction to the start of the next, not from the end of one to the start of the next. Timed the wrong way, contractions five minutes apart look like seven, and you stay home longer than you should.
Record three things for each one: when it started, how long it lasted, and how strong it was — a simple mild / moderate / cannot-talk-through-it scale is enough. An hour of that is a real answer. Ten minutes of it is not.
The threshold that matters at term is the 5-1-1 rule: contractions five minutes apart, each lasting about a minute, sustained for a full hour. Our guide to the signs of labour covers what happens after that call, and the contraction timer does the arithmetic if you would rather not do it between contractions.
Before 37 Weeks, Tightenings Are a Different Question
Everything above assumes a full-term pregnancy. Before 37 weeks the calculus changes, because the thing you are ruling out is preterm labour rather than a false alarm — and preterm labour is time-sensitive in a way that a 39-week false alarm is not.
Call your midwife or maternity unit the same day if you are under 37 weeks and have: regular contractions or tightenings, period-type pains, a gush or trickle of fluid from the vagina, or backache that is not usual for you.
Do not wait to see whether it settles, and do not apologise for calling. Assessment is quick, and being sent home reassured is the expected outcome.
When to Call at Term
Past 37 weeks, practice contractions rarely need a phone call. These do, whatever the pattern looks like:
- Strong contractions five minutes apart for an hour, or contractions you cannot talk through.
- Any vaginal bleeding heavier than light spotting.
- A gush or trickle of fluid — waters breaking, whether or not contractions have started.
- Reduced or changed fetal movement. This one is not negotiable and never waits until morning — see our guide to counting kicks.
- A severe headache, vision changes or sudden swelling, which can point to preeclampsia rather than labour.
- Anything that simply feels wrong to you. Instinct is a legitimate reason to call, and maternity units say so.
At a Glance
Braxton Hicks are the uterus practising, not a countdown. They are irregular, they vary in length, they stay flat in intensity and they respond to water, an empty bladder and a change of position — none of which real labour cares about. Time from start to start for a full hour before deciding anything. Before 37 weeks, regular tightenings are a same-day phone call rather than a puzzle to solve at home. And a call that turns out to be a false alarm is still a call worth making.
Inside Baby Novum. The contraction timer records each tightening with one tap, keeps the running averages for length and interval, and fires a 5-1-1 alert when the pattern holds for an hour — so the decision is made from an hour of data rather than from the last two contractions you happen to remember.
Next: Signs of Labor: When to Go to the Hospital → · Third Trimester Guide → · Hospital Bag Checklist →
Frequently Asked Questions
When do Braxton Hicks contractions start?
The uterus is thought to contract in this way from around 6 weeks of gestation, but almost nobody feels it that early. Most women first notice Braxton Hicks in the second or third trimester, and they usually become more frequent and more obvious in the final weeks before birth.
How long do Braxton Hicks contractions last?
Each one may last less than 30 seconds or up to about 2 minutes, and the length varies from one to the next. That irregularity is the point: real labour contractions settle into a consistent length that grows over time, while practice contractions stay unpredictable.
Are Braxton Hicks painful?
They are usually uncomfortable rather than painful — a tightening or hardening across the bump that eases off on its own. Some women describe mild period-like cramping. Contractions strong enough that you cannot talk through them are not Braxton Hicks, and are worth timing.
Can you mistake Braxton Hicks for real contractions?
Yes, and it is extremely common — especially with a first baby. A single tightening tells you almost nothing. What separates them is the pattern over an hour: real labour gets longer, stronger and closer together no matter what you do, while practice contractions fade with rest, water and a change of position.
Should I time Braxton Hicks contractions?
Time them whenever you are unsure. Timing is what turns a vague worry into an answer, and it costs an hour. Measure from the start of one contraction to the start of the next, not from the end of one to the start of the next — that is the number your midwife will ask for.
What position helps with Braxton Hicks?
Change whatever you were doing. If you were standing or walking, lie down on your left side; if you were lying still, get up and walk. Drinking a large glass of water, emptying your bladder and a warm bath also help, because dehydration and a full bladder are common triggers.
Do Braxton Hicks mean labour is close?
Not on their own. They often become stronger and more frequent in the last few weeks, but they do not open the cervix, and women have them for weeks without going into labour. They are not a countdown — they are the uterus rehearsing.
Is it normal to get Braxton Hicks after sex or after exercise?
Yes. Sexual activity, physical exertion, lifting something heavy, a full bladder and dehydration are all recognised triggers. Tightenings that follow one of those and settle within an hour of resting and rehydrating are behaving exactly as practice contractions do.