Why does preterm labour cause back pain in pregnancy?

During labour, the uterus tightens and the cervix begins to change. That activity can produce a dull ache, pressure, or pain across the lower back, sometimes arriving in waves. The baby’s position and pressure in the pelvis may add to the sensation. Back pain from ordinary pregnancy strain is often related to posture or movement, while labour-related discomfort may come with tightening, pelvic pressure, period-like cramps, a change in vaginal discharge, or fluid leakage. Preterm labour refers to labour beginning before the pregnancy reaches term, so possible signs should be assessed promptly.

Stop strenuous activity, rest on your side, and note when pain or tightening begins and whether it repeats. Contact your maternity unit promptly if the pain is new, persistent, or accompanied by pelvic pressure, cramps, bleeding, fluid leakage, or a change in discharge. Avoid taking medicine for the pain without checking that it is suitable in pregnancy. A maternity team may assess contractions, the cervix, fluid, and the baby.

Seek urgent maternity advice for repeated tightening, vaginal bleeding, suspected waters breaking, a gush or trickle of fluid, fever, severe constant pain, or reduced baby movement. Emergency help is needed for heavy bleeding, collapse, or severe pain with feeling faint. Do not wait for the pain to become intense before calling.

Ask whether your symptoms could represent contractions, how to monitor them, which warning signs require immediate return, and whether you need tests or observation. Tell the team how far along the pregnancy is and describe any fluid, bleeding, or movement change.