Condition Guide
Sciatica
During Pregnancy & Postpartum
That shooting pain from your back down your leg — what’s actually happening, and why it can be so intense.
What’s Happening
One nerve — from your lower back to your foot — under pressure.
The sciatic nerve runs from your lower spine, through the piriformis muscle in your buttock, and down the back of your leg. In pregnancy, two changes gang up on it: the deepening curve of your lower back can compress the nerve roots at L4–L5, and the piriformis tightens as your pelvis shifts — pinching the nerve where it passes through.
“Many moms describe it as an electric shock from hip to foot; others as a deep ache through the buttock. Both are sciatic irritation — just at different points along the nerve.”
Why It Gets Worse
What triggers and intensifies it.
Third-trimester weight & positioning.As baby drops lower into the pelvis, pressure on the lumbar spine and piriformis climbs — which is why sciatica often starts late.
Prolonged sitting.Sitting compresses the lumbar discs and tightens the piriformis at once, so the worst flares often follow long stretches in a car or chair.
Asymmetrical movement & SI-joint instability.Stepping up, climbing stairs, or an unstable SI joint drives compensatory hip tension that squeezes the nerve.
What Actually Helps
Approaches for the nerve, the joint, and the muscle.
SI joint stabilization
Steadying the sacroiliac joint eases the compensatory piriformis tension on the nerve — targeted SI support, not just belly support.
Piriformis stretching
A gentle figure-four stretch, seated or lying, releases the muscle compressing the nerve and often gives quick relief.
Sleep positioning
Lie on the non-affected side with a pillow between your knees to ease overnight piriformis tension and morning symptoms.
What to avoid
Prolonged sitting without lumbar support, carrying weight on the affected side, and sudden outward hip rotation all compress the nerve.
Postpartum
Why it can linger after delivery.
Sciatica often lifts once the uterus no longer presses on the nerve — but for many moms it persists, because relaxin keeps the SI joint loose for months and the asymmetrical demands of carrying and feeding keep the piriformis irritated. If it lasts beyond six to eight weeks postpartum, a women’s-health PT can pinpoint whether it’s piriformis, SI joint, or disc-related and treat accordingly.
Have questions about your own body?
Talk with Jenn about your sciatica.
Tell Jenn where you feel it and when it’s worst — she’ll explain what’s driving it and what addresses the root cause.
Talk with Jenn →Free · no pressure · about a minute
Want the complete breakdown? Read the full sciatica guide on Jenn →
This page provides educational information only and is not a substitute for professional medical advice. Always consult your healthcare provider for personal medical guidance.