Back pain and sciatica in pregnancy: causes, relief and when to see someone
Back pain is one of the most common physical complaints of pregnancy, and if you are dealing with it right now, you are very much not alone. Research suggests that up to 70% of pregnant people experience some form of back pain, with the likelihood increasing as pregnancy progresses into the second and third trimesters. While it is rarely a sign of anything serious, it can range from a low-level ache that is easy to ignore to pain that genuinely disrupts sleep, work and daily life. Understanding what is causing it, what helps, and when to ask for support can make a real difference.
Why back pain is so common in pregnancy
Several things happen in your body during pregnancy that together put a lot of extra demand on your back. From early in the first trimester, a hormone called relaxin is released to prepare your body for birth. Relaxin loosens the ligaments that normally keep your joints stable, including those in your pelvis and lower spine. This is helpful for delivery, but it also means your back has less structural support than usual throughout the whole of pregnancy.
As your baby grows, your uterus expands forward, shifting your centre of gravity. To compensate, many people unconsciously adjust their posture, often arching the lower back more than normal. This places a sustained strain on the muscles and joints of the lumbar spine. Add the steady increase in weight you are carrying and it becomes clear why your back bears the brunt, particularly in the third trimester when the baby is at their heaviest.
Back pain, PGP and sciatica: what is the difference?
Not all pregnancy-related back and pelvis pain is the same thing, and it is worth understanding the distinctions so you can describe what you are experiencing accurately to your midwife or GP.
General pregnancy-related back pain tends to sit in the lower back. It is usually a dull, persistent ache that worsens with prolonged standing or sitting and eases with rest or gentle movement. It stays in the back and does not radiate elsewhere.
Pelvic girdle pain (PGP), sometimes called symphysis pubis dysfunction or SPD, is centred around the pelvis rather than the spine. The pain often concentrates around the symphysis pubis at the front, the sacroiliac joints at the back, or both. It frequently causes pain when walking, climbing stairs, turning over in bed, or putting weight through one leg at a time. PGP is covered in detail in its own article.
True sciatica is different again. The sciatic nerve is the longest nerve in the body, running from the lower back through the buttock and down each leg. When the growing uterus, a shifted pelvis or changes in posture put pressure on this nerve, it can cause pain that shoots from the lower back down through the buttock and into the leg, sometimes reaching the calf or foot. Pins and needles, numbness or a burning sensation in the leg are also common with sciatica. The key distinguishing feature is that the pain radiates down the leg rather than staying in the back.
Safe home remedies for back pain in pregnancy
There are several things you can try at home that are safe during pregnancy and that many people find genuinely helpful. A warm compress or a warm bath can ease muscle tension in the lower back. Make sure the water is comfortably warm rather than hot, and keep baths to a reasonable length, especially in the first trimester.
When you sleep, lying on your left side with a pillow between your knees helps to keep your hips and pelvis in a neutral position and takes pressure off the lower back. A pregnancy pillow, or even an ordinary pillow tucked under your bump, can add extra support. Try to avoid sleeping flat on your back from around the second trimester onwards.
It can be tempting to rest completely when your back hurts, but staying gently mobile usually helps more than it hinders. Short, regular walks, swimming or prenatal yoga are all low-impact options that keep the supporting muscles active without overloading the spine. If you sit at a desk, use a chair with lumbar support and take short breaks to stand and move every 30 to 45 minutes. The same applies if your day involves prolonged standing.
Physiotherapy and pregnancy-specific exercises
Your GP or midwife can refer you to a physiotherapist who specialises in pregnancy-related musculoskeletal problems. A referral is well worth asking for if your back pain is persistent or affecting your daily life: a physiotherapist can assess your posture and movement patterns and give you exercises tailored to your specific situation.
Some exercises that are widely recommended for pregnancy back pain include pelvic tilts, which gently strengthen the deep abdominal and back muscles, and the cat-cow stretch, which mobilises the spine and relieves tension. Swimming is also excellent because the water supports your body weight, removing the load from your back while you move. What to avoid includes high-impact exercise, any movement that causes or worsens pain, and lying flat on your back for extended periods from the second trimester onwards, as this can compress the vena cava and feel uncomfortable.
Prenatal massage for back pain
Massage from a therapist who is specifically trained in prenatal techniques is generally considered safe from the second trimester. A qualified prenatal massage therapist will know which positions to use (lying on your side rather than your front or back), which pressure points to avoid, and how to work safely around the bump. Many people find it genuinely effective for easing lower back muscle tension.
It is important that the therapist holds a recognised qualification in prenatal massage. If you are unsure where to start, ask your midwife for a recommendation or check with a professional body in your country. For a more detailed look at what prenatal massage involves and how to find a qualified therapist, see our related article below.
Pain relief options during pregnancy
When back pain is significant, you may want to consider pain relief. Paracetamol is generally the first-choice option for short-term pain relief during pregnancy and is widely used. Always take the lowest effective dose for the shortest time needed, and check with your GP or midwife before taking it regularly, as guidance on long-term use continues to be reviewed.
NSAIDs such as ibuprofen are generally avoided during pregnancy, particularly in the third trimester, as they can affect the baby's kidney function and may cause complications with the amniotic fluid. Your GP will advise if there is any exception in your case. Opioid-based medications should only be taken under direct medical supervision.
Some people also find topical heat products helpful for muscle pain, applied directly to the lower back. TENS machines (transcutaneous electrical nerve stimulation) are another option that some people use in pregnancy, though they are typically avoided in the first trimester and near the abdomen or pelvis. Ask your midwife or physiotherapist whether a TENS machine might be appropriate for you.
When to seek urgent medical attention
Most pregnancy back pain is musculoskeletal and, while very uncomfortable, is not dangerous. However, certain symptoms alongside back pain need prompt medical attention. Contact your maternity unit or GP urgently if you experience sudden, severe back pain that comes on quickly rather than building gradually; back pain that is accompanied by a fever; back pain alongside vaginal bleeding; or any loss of bladder or bowel control. These symptoms can point to conditions unrelated to the musculoskeletal changes of pregnancy and should not wait for a routine appointment. When in doubt, call your midwife or maternity triage.
Frequently asked questions
Is back pain normal in pregnancy?
Yes, very common. Research suggests up to 70% of pregnant people experience some degree of back pain, particularly in the second and third trimesters. The relaxin hormone loosens ligaments while your growing baby shifts your centre of gravity, putting extra load on the lower back. Back pain does not mean something is wrong with your pregnancy.
What is the difference between back pain and pelvic girdle pain in pregnancy?
Pelvic girdle pain (PGP) centres around the pelvis and pubic symphysis. It often causes pain when walking, climbing stairs or turning over in bed. General pregnancy back pain stays in the lower back and tends to feel like a dull, persistent ache. Both are common, and both can be helped significantly with physiotherapy.
How can I sleep with back pain during pregnancy?
Lying on your left side with a pillow between your knees takes pressure off the lower back and improves circulation. A pregnancy pillow or a regular pillow tucked under the bump can help too. From the second trimester onwards, try to avoid lying flat on your back for prolonged periods, as this can compress a major blood vessel and feel uncomfortable.
Is it safe to take paracetamol for back pain when pregnant?
Paracetamol is generally considered the first-choice pain reliever in pregnancy and is regarded as safe for short-term use at the lowest effective dose. That said, always check with your GP or midwife before taking any medication during pregnancy, as guidance can evolve and your specific circumstances matter.
Can sciatica harm my baby?
No. Sciatic nerve pain is caused by pressure on the nerve from the expanding uterus or a shifted pelvis, not by anything affecting your baby directly. It can be very uncomfortable for you, but it is not a risk to your baby's health or development.
When should I see a doctor about back pain in pregnancy?
Seek urgent help if you have sudden severe back pain, pain with a fever, pain alongside vaginal bleeding, or any loss of bladder or bowel control. These can indicate something more serious than musculoskeletal pain. For persistent back pain without any of these red flags, your GP or midwife can refer you to a physiotherapist.
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