Aches & Pains
Back Pain in Pregnancy
Common as your bump grows and posture shifts — usually eased with posture, gentle movement and support, but some patterns 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
- How common
- Affects most people by the third trimester
- When it typically starts
- Second trimester onward
- Usual cause
- Growing bump, shifting posture, loosened ligaments
- Helped by
- Posture, gentle exercise, support pillows, warmth
- See a doctor if
- Pain comes with fever, bleeding or regular tightening
As your pregnancy progresses, it's very common for your back — especially your lower back — to start aching. Your growing bump shifts your centre of gravity, your posture changes to compensate, and pregnancy hormones loosen the ligaments that support your spine and pelvis, all of which can leave your back feeling stiff, sore or achy by the end of the day.
For most people, back pain in pregnancy is uncomfortable rather than serious, and there's a lot you can do to ease it. This guide explains why it happens, what's considered a normal ache, the self-care that helps, and the warning signs — like pain with fever, bleeding or regular tightening — that mean you should get checked.
What is pregnancy back pain?
Pregnancy back pain usually refers to aching or stiffness in the lower back (lumbar) and sometimes the upper back, that develops or worsens as pregnancy progresses. It's caused by a combination of your changing shape, extra weight, and the hormone relaxin, which softens the ligaments around your pelvis and spine ready for birth — but also makes your joints less stable in the meantime.
It often builds gradually through the second and third trimesters, tends to be worse at the end of the day or after standing or sitting for long periods, and usually eases with rest, movement and posture changes. It's different from pelvic girdle pain, which centres more on the front and sides of the pelvis and hips, though the two can overlap.
Not the same as pelvic girdle pain
General back pain and pelvic girdle pain (PGP) often get mixed up. If your pain is mainly at the front of your pelvis, in your hips, or makes walking or turning over in bed painful, see our Pelvic Girdle Pain guide — the self-care is a little different.
What causes back pain in pregnancy?
Several normal pregnancy changes combine to put extra strain on your back.
Extra weight and a shifting centre of gravity
As your bump grows, your centre of gravity moves forward, and your lower back curves more to compensate. This extra curve (lordosis) puts more load on the muscles and joints of your lower back.
The hormone relaxin
Relaxin loosens the ligaments around your pelvis and spine so your body can accommodate your growing baby and prepare for birth. Looser ligaments mean less support for your joints, which can make your back feel less stable and more prone to aching.
Weakening abdominal muscles
Your abdominal muscles stretch and separate as your bump grows, meaning they do less to support your spine — so your back muscles pick up more of the load.
Posture and daily habits
Standing or sitting for long periods, poor lifting technique, wearing unsupportive shoes, or sleeping in an awkward position can all add to the strain.
Stress and tiredness
Muscle tension from stress or disturbed sleep can make any ache feel worse, and pregnancy often brings both.
You may be more prone to it if…
- You've had back pain before pregnancy or in a previous pregnancy
- You're carrying twins or more
- You do a lot of standing, bending or lifting
- You have weaker core or back muscles
When back pain is normal
Some aching and stiffness is an expected part of later pregnancy. These are usually reassuring:
- A dull ache or stiffness in your lower back that builds through the day and improves with rest.
- Pain that's worse after standing, sitting or being on your feet for a long time.
- Discomfort that responds to posture changes, stretching, warmth or a change in position.
- Pain that stays roughly the same day to day rather than steadily worsening or spreading.
| Usually normal back pain | Needs medical attention | |
|---|---|---|
| Pattern | Constant ache, comes and goes with activity | Rhythmic pain that tightens and releases regularly |
| Other symptoms | None — you feel otherwise well | Fever, burning when you wee, or vaginal bleeding |
| Onset | Gradual, builds over weeks | Sudden and severe, or before 37 weeks with tightening |
A little discomfort doesn't mean something is wrong
Mild, manageable back pain is one of the most common pregnancy complaints and does not on its own mean anything is wrong with you or your baby.
Warning signs — get medical help now
Occasionally back pain signals something that needs urgent attention. Contact your midwife or doctor urgently, or go to your nearest emergency department, if you have:
Seek urgent medical care if you have
- Rhythmic low back pain that comes and goes with tightening across your bump before 37 weeks — this can be a sign of preterm labour.
- Severe back pain with a fever, chills, or burning or stinging when you pass urine — this may be a kidney infection.
- Back pain together with vaginal bleeding.
- Sudden, severe back pain that comes on abruptly, especially if it's different from your usual ache.
- Numbness, tingling or weakness in one or both legs.
- Loss of feeling in your inner thighs, buttocks or genital area ('saddle numbness'), or new loss of bladder or bowel control — this is rare but needs emergency care.
If your baby's movements feel reduced or different, contact your maternity unit the same day — don't wait until your next appointment.
Saddle numbness is a medical emergency
Numbness around your bottom and inner thighs with loss of bladder or bowel control (cauda equina syndrome) is rare but serious and needs emergency assessment straight away — go to A&E.
Self-care & home remedies
Most pregnancy back pain responds well to simple, safe measures.
Posture & movement
- Stand tall with your shoulders back rather than arching your lower back.
- Avoid standing for long periods; shift your weight or take breaks to sit.
- Bend at your knees, not your waist, when picking things up, and avoid twisting while lifting.
- Wear flat or low, supportive shoes rather than heels or unsupportive flats.
Sleep & rest
- Sleep on your side with a pillow between your knees and one supporting your bump.
- Use extra pillows to support your back when sitting for long periods.
- Avoid mattresses that are too soft to properly support your back.
Exercise & stretching
- Gentle activity like walking or swimming keeps your back muscles strong without strain.
- Pregnancy-safe stretches and pelvic tilts can ease tension — ask about a prenatal yoga or physiotherapy class.
- A physiotherapist experienced in pregnancy can teach exercises tailored to you.
Comfort measures
- A warm (not hot) compress or heat pack on the sore area can ease muscle tension.
- Gentle massage from a partner or a pregnancy-trained therapist can help.
- A pregnancy support belt may ease the load for some people — ask your midwife or physiotherapist if one is right for you.
Check before trying new treatments
Ask your midwife or doctor before starting any new supplement, massage oil or over-the-counter pain relief — even ones you'd normally use without a second thought.
When to consult a doctor
Book a non-urgent appointment with your midwife or doctor if:
- Back pain is affecting your sleep, mood or ability to manage daily activities.
- Home measures aren't helping after a couple of weeks of trying them.
- The pain is getting steadily worse rather than staying the same or easing.
- You'd like a referral to a physiotherapist experienced in pregnancy.
- You have a history of back problems that pregnancy seems to be aggravating.
Keep track of your symptoms
Logging when your back pain flares up — and what helps — makes it easier to spot patterns and gives your midwife useful detail at your next appointment.
Open the Pregnancy TrackerFrequently asked questions
Is back pain in pregnancy normal?
Yes — it's one of the most common pregnancy complaints, affecting most people to some degree, especially from the second trimester onwards. It's usually caused by your changing shape, extra weight and loosening ligaments, and it's rarely a sign of a problem.
Can back pain mean labour is starting?
It can. Rhythmic low back pain that comes and goes together with tightening across your bump — especially before 37 weeks — can be a sign of labour, so contact your midwife if you notice this pattern.
How is back pain different from sciatica in pregnancy?
Ordinary back pain tends to stay in your lower back. Sciatica causes pain that shoots down one leg, often with tingling or numbness, because the sciatic nerve is being compressed. Both are common and the self-care overlaps, but sciatica sometimes needs specific physiotherapy advice.
Is it safe to exercise with back pain in pregnancy?
Yes, gentle pregnancy-safe exercise like walking, swimming or antenatal yoga usually helps rather than harms, by keeping your back muscles strong and flexible. Stop and check with your midwife if any exercise increases your pain.
Can I take pain relief for back pain while pregnant?
Some pain relief is considered safe in pregnancy, but you should always check with your doctor, midwife or pharmacist before taking anything — including medicines you'd normally buy over the counter — to make sure it's suitable at your stage of pregnancy.
When should I worry about back pain in pregnancy?
See a doctor urgently if pain comes with fever, burning when you wee, vaginal bleeding, rhythmic tightening before 37 weeks, leg weakness or numbness, or loss of bladder or bowel control. These need prompt assessment.
Your next steps
Track your pregnancy
Log symptoms week by week, get personalised tips, and see how your pregnancy is progressing.
Open Pregnancy TrackerPregnancy week-by-week
Follow your baby's growth and your body's changes from week 1 to 40 in plain language.
Explore the guideFind a gynaecologist
Have a personal concern? Book with a trusted obstetrician or gynaecologist near you.
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 — Back pain in pregnancy
- ACOG — Back Pain During Pregnancy
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.
Read our Medical Disclaimer, Editorial Policy and Medical Review Policy.