Why does preterm labour cause Braxton Hicks contractions?

The uterus can tighten during pregnancy as it prepares for birth. These practice tightenings are often irregular, short-lived, and may settle with rest, hydration, or a change of activity. Preterm labour involves uterine contractions that may become regular and contribute to cervical change before term. At first, the sensations can resemble Braxton Hicks contractions, which is why timing and accompanying symptoms matter more than the label. Pelvic pressure, period-like cramps, low backache, fluid leakage, bleeding, or a new change in discharge can occur alongside labour and should not be ignored.

Pause and record when each tightening starts, how long it lasts, and whether the pattern changes. Rest on your side, drink fluids if you have not been advised to restrict them, and contact your maternity unit if tightenings continue or become regular. Do not rely on home observation to decide that contractions are harmless when you are before term; a clinician may need to assess the cervix, baby, and any fluid or bleeding.

Seek urgent maternity advice for regular or increasingly painful tightenings, pelvic pressure, low back pain, bleeding, suspected waters breaking, unusual discharge, fever, or reduced baby movement. Call emergency services for heavy bleeding, severe pain, collapse, or difficulty breathing. Keep the maternity unit’s contact details accessible.

Ask how to time tightenings, which pattern should prompt a call, and how your team will check for cervical change or ruptured membranes. Ask what activity, hydration, and medicines are appropriate for your pregnancy.