Back pain during pregnancy: what helps and when it needs a doctor

Back pain during pregnancy is common, especially from the second trimester, and it usually gets worse in the third as your bump grows. A KKH specialist names weight gain as the main cause: it shifts your centre of gravity and changes your posture, while the hormone relaxin loosens the ligaments that support your spine. Most of the relief is simple: heat or cold, good shoes, not standing or sitting too long, sleeping on your side with your knees bent, and a maternity support belt. Don't take anti-inflammatory painkillers such as ibuprofen without your doctor, because KKH says they aren't recommended in pregnancy. Severe back pain that won't ease can be a sign of miscarriage or early labour, so that needs a doctor straight away.

Why your back hurts in pregnancy

Dr Jessie Phoon of KKH explains that weight gain is the major factor. As your belly grows, your body's centre of gravity moves forward and your posture changes to balance it, and that strains your back. The pregnancy hormone relaxin plays a smaller part by loosening the ligaments around your spine, which can make it less stable.

Lower back pain typically starts in the second trimester, when your growing womb begins to press on your spine. Another KKH doctor says it's usually worse in the third trimester because of the size and weight of the pregnancy. Stress doesn't cause back pain, but KKH says it can make mild pain feel worse and tighten your muscles. Our 26 weeks pregnant guide covers the aches of that stage, and our pregnancy weight gain calculator shows a healthy range for your BMI.

Everyday fixes for a Singapore day

These come from KKH doctors and the Health Promotion Board, matched to the moments that usually set the pain off:

A maternity support belt helps some women, and KKH says it recommends them, mostly in the second and third trimesters. KKH also suggests short sessions in a sauna or steam room can ease back pain, but not in the last trimester, especially close to your due date. Our guide to pregnancy sleeping positions shows how to use pillows to support your bump and back at night.

Exercise that helps your back

HPB says appropriate resistance training in pregnancy keeps your muscles and joints strong and reduces body aches. For general fitness it lists brisk walking, swimming, stationary cycling (a recumbent bike with back support may be more comfortable) and cross-trainers as suitable through a normal pregnancy, at a pace where you can still hold a conversation. After about four months, don't exercise lying flat on your back, because the weight of your womb can press on a large blood vessel.

Exercises that strengthen your back muscles help too, and KKH says some involve light weights under 5kg. Check with a physiotherapist or exercise physiologist before you start them. SGH's physiotherapy department runs an antenatal class with a one-to-one assessment. Our guides to safe exercise in pregnancy, prenatal yoga and prenatal pilates cover specific moves.

Painkillers, patches and massage

KKH's message on medicine is not to self-medicate. Talk to your doctor before you take anything for back pain:

• NSAIDs such as ibuprofen aren't recommended in pregnancy, because KKH says they can harm the baby and cause premature birth. Aspirin is only used in specific situations on a doctor's advice.
• Paracetamol is considered relatively safe in pregnancy, but still check with your doctor first.
• Pain patches and gels are generally safe because very little is absorbed, but KKH says to use them as little as possible.
• KKH hasn't studied acupuncture or chiropractic treatment for pregnancy back pain, so ask your doctor before booking.

A gentle massage at home helps many women. For professional massage, our prenatal massage guide covers what to check before you book.

When back pain needs a doctor

Our guide to common pregnancy discomforts by trimester covers the other aches and which ones need a call. If the ache sits higher, under your ribs, see rib pain during pregnancy, and for the months after the birth, back pain after pregnancy.

Frequently asked questions

When does back pain start in pregnancy?

KKH says lower back pain typically starts in the second trimester, when your womb begins to press on your spine, and it's usually worse in the third trimester.

What can I take for back pain while pregnant?

Paracetamol is considered relatively safe, and patches or gels are generally fine in small amounts, but ask your doctor first. KKH says NSAIDs such as ibuprofen aren't recommended in pregnancy.

Does a maternity belt help back pain?

It helps some women. KKH says it recommends support belts, which are used more in the second and third trimesters.

What is the best sleeping position for back pain in pregnancy?

On your side with your knees bent, as KKH advises. Avoid sleeping on your back.

Can back pain be a sign of labour?

Yes. KKH says early labour can feel like mild period cramps or a backache, and severe back pain can occasionally signal miscarriage or early labour. See a doctor if it's severe or comes in waves.