Bladder & Uterus
Braxton Hicks Contractions
Irregular, usually painless 'practice' tightenings of the womb — normal from the 2nd trimester, but regular or early ones need checking.
Written and fact-checked by the ParentVibes editorial team against WHO, NHS, ACOG and peer-reviewed guidance. Not yet reviewed by a named clinician.
Quick facts
- When they start
- Often from around 16–20 weeks, more noticeable in 3rd trimester
- Feel like
- Bump tightening/hardening, 30–60 seconds
- Pattern
- Irregular, unpredictable, don't get closer together
- Eases with
- Rest, position change, warm bath, hydration
- Get checked if
- Regular, painful, or before 37 weeks
At some point in the second half of pregnancy, most people notice their bump suddenly go tight and firm, hold for a while, then release. These are Braxton Hicks contractions — sometimes called "practice contractions" — and they're a completely normal part of your womb preparing itself for the real thing.
They can feel surprisingly strong, which understandably makes people wonder if labour is starting. This guide explains what they are, how to tell them apart from true labour, and — most importantly — the signs that mean what you're feeling could be preterm labour rather than harmless practice.
What are Braxton Hicks contractions?
Braxton Hicks contractions are irregular tightenings of the muscles of the womb. Your bump feels firm or hard to the touch for anywhere from a few seconds to about a minute, then softens again. They can start as early as 16 weeks but are usually first noticed in the second half of pregnancy, and tend to become more frequent and noticeable as you approach your due date.
Unlike true labour contractions, Braxton Hicks don't get progressively closer together, don't steadily increase in strength, and don't open (dilate) the cervix. They're thought to help tone the womb muscle ahead of labour, and they're a normal, harmless part of pregnancy for most people.
Not everyone notices them
Some people feel Braxton Hicks regularly from mid-pregnancy onwards; others barely notice them at all. Both are entirely normal — it doesn't predict anything about your labour.
What triggers Braxton Hicks contractions?
Braxton Hicks happen spontaneously, but certain things commonly bring them on or make them more noticeable.
Physical activity or a full day on your feet
Being active, walking a lot, or standing for long periods can trigger a bout of tightenings, which usually ease once you rest.
Dehydration
Not drinking enough fluids is a common trigger — dehydration is linked to more frequent Braxton Hicks, and rehydrating often settles them.
A full bladder
A full bladder can press on the womb and set off tightenings; emptying your bladder can bring quick relief.
Sex
Orgasm and the physical activity of sex can trigger Braxton Hicks; this is normal and not a sign of harm to you or your baby unless you're specifically advised otherwise.
Your baby's movements
A particularly active spell from your baby can sometimes trigger a tightening as your womb responds.
Later in pregnancy generally
Braxton Hicks naturally become more frequent and noticeable as you approach term, as your womb continues its "practice runs" ahead of true labour.
Quick ways to ease a bout
- Drink a glass or two of water
- Change position — sit if you've been standing, walk if you've been sitting
- Empty your bladder
- Have a warm (not hot) bath or shower
- Try slow, deep breathing until it passes
When Braxton Hicks are normal
Braxton Hicks are a normal, expected part of the second half of pregnancy. Reassuring features include:
- They're irregular — no set pattern, and they don't creep closer together over time.
- They're painless or only mildly uncomfortable, more like tightness than pain.
- They ease off with rest, a change of position, or drinking water.
- They don't come with bleeding, fluid loss, or a low, heavy pelvic pressure.
- You're at or beyond 37 weeks, when your body is genuinely getting ready for labour.
| Braxton Hicks (practice) | Possible true / preterm labour | |
|---|---|---|
| Pattern | Irregular; doesn't form a steady rhythm | Regular, and coming closer together |
| Intensity | Stays roughly the same, or eases | Gets steadily stronger and longer |
| Pain | Mild tightness, rarely painful | Increasingly painful, period-like or lower-back ache |
| Response to rest | Settles with rest, fluids or position change | Continues despite resting |
| Other signs | None | Fluid loss, bleeding, or pelvic pressure |
After 37 weeks, changing patterns are expected
Close to and at term, Braxton Hicks can become quite frequent and intense as your body genuinely prepares for labour — this is normal. The same pattern before 37 weeks is what needs checking (see warning signs).
Warning signs — contact your maternity unit immediately
Contact your midwife or maternity unit immediately — especially before 37 weeks — if you notice any of the following, as they can indicate preterm labour:
Seek urgent medical care if you have
- Contractions or tightenings that become regular and keep coming, at increasingly shorter intervals.
- Tightenings that become more frequent, longer-lasting, or increasingly painful.
- Low, dull backache that comes and goes rhythmically.
- A feeling of pelvic pressure, as if the baby is pushing down.
- Any vaginal bleeding, spotting, or unusual discharge alongside tightenings.
- A gush or trickle of fluid from your vagina.
- Period-like cramping that doesn't ease with rest.
All of these before 37 weeks need same-day assessment, as they can be signs of preterm labour, which is often treatable if caught early. As with any pregnancy symptom, reduced or absent baby movements should also be reported to your maternity unit the same day.
Before 37 weeks — don't wait it out
Regular, painful, or increasingly frequent tightenings before 37 weeks — especially with backache, pressure, fluid loss or bleeding — need urgent assessment. Contact your maternity unit straight away; there are things that can be done to help if it is preterm labour.
Self-care for Braxton Hicks
Most Braxton Hicks settle quickly with simple measures.
Change what you're doing
- If you've been active, sit or lie down and rest.
- If you've been sitting or lying for a while, get up and move around gently.
- Lying on your side, rather than your back, is often the most comfortable position.
Hydrate
- Drink a glass or two of water, as dehydration is a common trigger.
- Keep a water bottle with you through the day, particularly in warm weather.
Relax your body
- Try slow, deep breathing through each tightening.
- A warm bath or shower can help the muscles relax.
- Gentle stretching or a change of position can ease persistent tightness.
Empty your bladder
- A full bladder can trigger or worsen tightenings, so use the toilet if you haven't recently.
Time them if you're unsure
If tightenings feel different or more frequent than usual, try timing them from the start of one to the start of the next for an hour. Regular, closer-together timing is a good reason to call your maternity unit, whatever the trimester.
When to consult a doctor or midwife
Call your midwife or maternity unit for advice — don't wait for a routine appointment — if:
- You're not sure whether what you're feeling is Braxton Hicks or true labour, at any stage.
- Tightenings are frequent enough to worry you, even if they seem irregular.
- You're under 37 weeks and having more than a handful of tightenings in an hour.
- Rest, fluids and position changes aren't easing them.
- You simply want reassurance about what you're feeling — this is always a good reason to call.
Time and log your tightenings
Tracking when tightenings happen and how long they last makes it much easier to describe your pattern accurately if you do need to call your maternity unit.
Open the Pregnancy TrackerFrequently asked questions
How do Braxton Hicks contractions feel?
Most people describe them as their bump suddenly going tight, firm or hard, a bit like a mild period cramp or a muscle tensing, lasting anywhere from a few seconds up to about a minute, then releasing. They're usually painless or only mildly uncomfortable.
How can I tell Braxton Hicks apart from real labour?
Braxton Hicks are irregular, don't get steadily closer together, tend to stay mild, and usually ease with rest, fluids or a change of position. True labour contractions become regular, get closer together, grow stronger and longer, and don't stop with rest. If you're ever unsure, contact your maternity unit.
Can Braxton Hicks happen before 37 weeks?
Occasional, irregular, painless tightenings can happen from as early as 16 weeks and are usually harmless. However, if tightenings become regular, frequent, painful, or come with backache, pelvic pressure, fluid loss or bleeding before 37 weeks, contact your maternity unit immediately, as this can indicate preterm labour.
What triggers Braxton Hicks contractions?
Common triggers include physical activity, dehydration, a full bladder, sex, and your baby moving. They also naturally become more frequent as you approach your due date, as your womb continues preparing for labour.
Do Braxton Hicks mean labour is about to start?
Not directly — they can happen for weeks or even months before true labour begins, and having a lot of them doesn't mean labour is imminent. Real labour is signalled by contractions becoming regular and progressively stronger, closer together and longer, often alongside other signs like your waters breaking.
When should I call my maternity unit about tightenings?
Call immediately if tightenings become regular and increasingly frequent, painful, or longer-lasting — especially before 37 weeks — or if they come with backache, pelvic pressure, vaginal bleeding, or a gush or trickle of fluid. At any stage, call if you're simply unsure what you're feeling.
Your next steps
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Explore the guideFind a gynaecologist
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Find a doctorRelated pregnancy symptoms
Helpful resources
Sources
- NHS — Pregnancy: common symptoms & concerns
- ACOG — Pregnancy resources (American College of Obstetricians and Gynecologists)
- WHO — Maternal health & pregnancy care
- NHS — Signs of labour
- ACOG — Preterm Labor
Next review due: 6 January 2027.
Medical disclaimer
This page is general information about a common pregnancy symptom and does not replace personal medical advice. Every pregnancy is different. If you have severe pain, heavy bleeding, a bad headache with vision changes, reduced or absent baby movements, breathing difficulty, fever, or you feel something is seriously wrong, contact your doctor or midwife or go to your nearest emergency department straight away. When in doubt, always get checked — it is never a waste of anyone's time.
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