Sciatica during pregnancy

By trimester

Weeks 1–13

1st trimester

True sciatica is uncommon this early, since the joint laxity and uterine growth that usually bring it on haven't built up yet. Shooting leg pain now more often points to an older disc or nerve issue than a new pregnancy cause, so mention any past disc problems or sciatica at your first prenatal visit.

Weeks 14–27

2nd trimester

Pelvic girdle pain often shows up now and can feel similar to sciatica, since both can radiate toward the buttock. Your provider can usually tell them apart with a few hands-on movement tests, no imaging needed. Starting gentle piriformis and hamstring stretches now, before pain builds, tends to help either pattern.

Weeks 28–birth

3rd trimester

Your growing belly and the baby's position put the most pressure on your pelvis and low back now, so sciatica is most likely to appear or get worse. Side-lying sleep with a pillow between your knees, switching positions often instead of standing or sitting too long, and daily stretches are the best routine. New numbness, leg weakness, or pain bad enough to affect walking needs a same-day call to your provider.

What does the evidence show for sciatica?

• Pregnancy hormones loosen the ligaments in your low back and pelvis, and your shifting weight and balance add extra strain, the two main drivers of pregnancy back and pelvic pain. 1
• A growing uterus sits close to the nerve pathway that forms the sciatic nerve, so its added size or position can press on that nerve and trigger real sciatica down the leg. 2
• Doctors can usually tell pelvic girdle pain apart from other causes of leg and back pain with a few hands-on movement tests in the office, without needing X-rays or scans. 3
• Staying active during pregnancy will not guarantee you avoid back or pelvic pain, but research on more than 52,000 pregnancies found exercise still made the pain noticeably milder. 4
• About one in five pregnant women deal with pelvic girdle pain, and pairing a support belt with targeted exercises and position changes works better than any single fix, a mix that also eases sciatica-like leg pain. 5
• Any history of bowel or bladder incontinence, urinary retention, or lower extremity weakness alongside sciatica suggests an acute neurologic deficit requiring aggressive workup, while fever, night sweats, chills, a history of trauma or malignancy, or immunocompromise redirect the search toward epidural abscess, hematoma, fracture, or metastasis. 6

When should I call my provider about sciatica?

Pregnancy sciatica is usually one-sided, tracks down the back of the leg, and shifts with position. Go in urgently for new bowel or bladder incontinence, for being unable to pass urine, or for weakness in the leg or foot, since that group signals an acute neurologic deficit rather than a mechanical flare. Fever, night sweats, or chills alongside back and leg pain is also out of pattern and sends the search toward infection instead. Pain that keeps escalating despite rest and position changes belongs in the same conversation rather than another week of stretches. None of these lists replace your own judgment: if this symptom worries you, that on its own is enough reason to check in with your healthcare provider.