Quick answer: That sudden tightening of your entire abdomen — your bump going firm and then releasing — is almost certainly Braxton Hicks contractions.
That sudden tightening of your entire abdomen — your bump going firm and then releasing — is almost certainly Braxton Hicks contractions. First described in 1872, they continue to alarm and confuse pregnant women today. Here’s exactly what they are, what sets them off, and how to tell when they’ve crossed into something requiring attention.
What Braxton Hicks Contractions Feel Like
Braxton Hicks are practice contractions — your uterine muscle tightening and releasing as it tones and prepares for labour. They typically feel like your abdomen going noticeably firm or hard for 30–60 seconds, a sensation of tightening or squeezing across the entire abdomen (not localized pain), and sometimes pressure in the groin or lower back. They’re usually painless, though some women find them uncomfortable particularly in the third trimester. They don’t typically build in intensity the way labour contractions do. Many women first notice them around weeks 16–20, though they may occur earlier without being felt.
Common Triggers
Braxton Hicks have well-established triggers: Dehydration — the most common trigger; when blood volume decreases even slightly, the uterus becomes more irritable. Drink a large glass of water and rest — many resolve within 30 minutes. Physical activity — exercise, long walks, and sexual activity commonly trigger them. Full bladder — bladder pressure can stimulate uterine contractions. Stress — emotional or physical stress increases uterine irritability. Being touched firmly on the bump. Baby’s movements.
Timing: When Does Pattern Matter?
The critical distinction between Braxton Hicks and true labour is pattern. Time them: Braxton Hicks: Irregular (every 20 min, then 8 min, then 35 min — no pattern), variable duration, don’t progressively intensify, and stop with hydration, rest, or position change. True labour: Regular and getting closer together (10 min → 7 min → 5 min), getting longer, getting stronger, and continuing regardless of rest. The 5-1-1 rule for hospital: contractions every 5 minutes, lasting 1 minute, for at least 1 hour.
When to Call Your Provider
Call immediately for: more than 4–6 contractions per hour before 37 weeks, contractions accompanied by lower back pain that radiates around to the front, pelvic pressure feeling like the baby is pushing down before 37 weeks, any vaginal bleeding or fluid leaking, decreased fetal movement, or contractions that become regular and progressively stronger before you expect labour.
Frequently Asked Questions
Can Braxton Hicks cause premature labour?
Braxton Hicks themselves don’t cause premature labour — they’re a normal feature of pregnancy. The concern is distinguishing them from genuine preterm contractions. Before 37 weeks, more than 4–6 contractions per hour regardless of how they feel warrants contacting your provider. Some women with early preterm labour initially describe contractions that feel like Braxton Hicks — the volume and regularity is the key differentiator.
Are Braxton Hicks worse in subsequent pregnancies?
Yes — many women report more frequent, earlier, and sometimes more uncomfortable Braxton Hicks in second and subsequent pregnancies. The uterus has already been stretched, uterine muscle responds more readily, and experienced mothers are more attuned to the sensations. They’re also sometimes stronger in third-trimester subsequent pregnancies.
Should I time every Braxton Hicks contraction?
Not if they’re clearly irregular and you know your triggers. Timing becomes important when: you’re unsure whether a pattern is labour or Braxton Hicks, you’re before 37 weeks with frequent contractions, or contractions seem to be increasing in frequency or intensity. When uncertain, time for one full hour — if regularity and intensity are increasing, call.
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Related Reading
- 21 weeks pregnant: Braxton Hicks or real contractions?
- Contraction timer: when should you go to hospital?
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