Lower Back Pain in the Third Trimester — What Actually Helps

Lower back pain is so common in late pregnancy that it's often dismissed as something to simply endure. Up to 70% of pregnant women experience it, and the third trimester is usually when it peaks. But common isn't the same as unavoidable — and the right combination of positioning, movement, and structural care can make a significant difference.

Why the Third Trimester Is Hardest on Your Back

Three things converge in the final months of pregnancy. First, the hormone relaxin reaches its peak, loosening ligaments throughout the body to prepare the pelvis for delivery — including ligaments that normally stabilise the spine and sacroiliac joints. Second, by week 28, most women have gained 12 to 15 kilograms, the bulk of it carried in front of the body. Third, your centre of gravity has shifted forward, which the lumbar spine compensates for by hyperextending. The result: ligaments that hold less, weight that pulls forward, and a lumbar curve forced deeper than it was designed to be.

What's Safe (and What Isn't)

• Safe: walking on flat surfaces, swimming, prenatal yoga (with an experienced instructor), side-sleeping with a pillow between the knees, gentle pelvic tilts, prenatal massage.
• Avoid: prolonged supine positions (lying flat on the back) after 20 weeks, heavy lifting, high-impact sports, deep twists, and any stretch that pushes through pain rather than easing it.

The general principle: gentle movement is your friend; sustained static positions and high loads are not.

Five Things You Can Change Today

1. Wear a pregnancy support belt (SI belt) — it offloads some of the weight from the lumbar spine onto the pelvis, which can dramatically reduce end-of-day pain. Worth trying for several days before deciding if it works for you.
2. Sleep on your left side with a pillow between your knees — keeps the pelvis level, reduces SI joint strain, and improves blood flow to the placenta. A small pillow under the bump helps too.
3. Do pelvic tilts on hands and knees — also called the "cat-cow" position. A gentle few minutes a day can reduce lumbar load and ease pain. No pushing into pain.
4. Wear supportive shoes — flat, cushioned, and stable. The pregnancy isn't the time for heels or unsupportive flats; both worsen the postural compensation.
5. Take micro-breaks every 30 minutes — sitting compresses the lumbar discs; standing for two minutes every half hour resets the load. Set a timer if you have to.

How Chiropractic Helps in Pregnancy

Pregnancy chiropractic isn't the same as adult chiropractic. The Webster technique is a gentle, side-lying approach designed specifically for pregnant women. There's no twisting, no pressure on the abdomen, and the adjustments focus on balancing the pelvis — which matters both for back pain and for fetal positioning later in pregnancy. In our clinical experience, many patients report better sleep, reduced lumbar pain, and easier movement after a few sessions. Our full pregnancy care page covers the technique in more detail, and our back pain page explains how the structural component of pain is addressed.

If you're in the third trimester and the pain is interfering with sleep or daily life, it's worth getting a Gonstead assessment. We see pregnant patients across Sunway Geo, Sri Petaling, and Kota Damansara. WhatsApp the closest branch and tell us how far along you are — we'll book accordingly.