You knew pregnancy was going to mean a lot of firsts — like feeling the incredible first flutter of your baby moving in your belly. But back pain that just won't go away? That might not have been quite the experience you had in mind when you first envisioned yourself with that proverbial pregnancy glow.

While a majority of mothers-to-be experience some dull, throbbing aches in the middle of the back or the butt, some grapple with the searing pain of sciatica during pregnancy, a painful but fortunately temporary condition.[1]

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Key Takeaways

Sciatica during pregnancy is sharp, shooting pain, tingling, or numbness that radiates from the lower back or buttocks down the legs.

Sciatica is caused by pressure on the sciatic nerve, which may be triggered by extra pregnancy weight, fluid retention, a growing uterus, or baby’s position. All of these can all compress the nerve, most often in the third trimester. Symptoms usually ease after birth.

To get relief from sciatica, use warm compresses on the area, get plenty of rest, try side-sleeping, use supportive mattresses/pillows, and do some gentle exercise (walking, swimming, pelvic tilts). Therapies like massage, acupuncture, or PT can help, too, and see your doctor if pain is severe.

What is sciatica?

sciatica medical illustration

Unlike your average pregnancy back pain, sciatica is a sharp, shooting pain, tingling or numbness that starts in the back or buttocks and radiates all the way down the backs of your legs.

Sciatica can be uncomfortable and painful. “I had [sciatica during] my last pregnancy but it wasn’t this bad,” says What to Expect Community user AzurePoppinz. “It’s to the point where it hurts so bad I’m limping at times!”

The sciatic nerve, the largest in the body, starts in the lower back, runs down the buttocks and branches down the back of the legs to the ankles and feet[2] In most cases, sciatica happens when this nerve gets compressed by bulging, slipped or ruptured discs, arthritis, or a narrowing of the spinal cord (also called spinal stenosis).

But rarely, women experience sciatica as a short-term side effect of pregnancy.

Have you had an aching back since you've been pregnant? Track your symptoms and get more information on the What to Expect app.

What causes sciatica during pregnancy?

You can blame sciatica during pregnancy on the usual suspects:[3]

  • Weight gain and increased fluid retention can put pressure on the sciatic nerve where it passes through the pelvis, compressing it.
  • Your expanding uterus might also press down on the sciatic nerve in the lower part of your spine.
  • Your growing belly and breasts shift your center of gravity forward and stretch your lordotic curve (the dip just above your butt). This can cause the muscles in your buttocks and pelvic area to tighten up and pinch the sciatic nerve.
  • Your baby's head can rest directly on the nerve when he starts to settle into the proper birth position in the third trimester.
  • A herniated or slipped disc caused by the extra pressure of your growing uterus can be the culprit, although this is less common.

When does sciatica usually start during pregnancy?

Sciatica will most likely occur during the third trimester, when both you and your baby are bulking up. It can develop earlier, but it's not common. Most women typically experience pain just on one side, though you may feel it in both legs.[4]

Sciatica can be constant or intermittent, depending on the amount of pressure placed on the nerve. Pain may increase as you put on more weight and retain more fluid.

And it can stick around for a few months or so after you've given birth, until you've shed the excess weight and fluid pressing on the nerve.

What you can do to relieve sciatica

  • Use a warm compress. Apply it on the spot where you feel the pain.
  • When you can, take a break off of your feet. Resting in a comfortable position can ease some leg and lower back pain.
  • Sleep on the side of your body that's pain-free. For example, if you feel pain on your left side, lie down on your right side. That's still okay, even though the "best" sleeping position for pregnant women is typically said to be the left side. “I slept on my side and it seemed to help relieve it, at least somewhat,” says user cmc31189.
  • For extra comfort at night, use a firm mattress with plenty of back support. You can also place a pregnancy pillow or a regular pillow between your legs to help keep the pelvis in better alignment and take some pressure off the sciatic nerve.
  • Try to avoid sitting for long stretches. Take frequent walking breaks, and try alternating between your desk (or the couch) and a Pilates ball. 
  • Do some pelvic tilts with your Kegel exercises. They'll help strengthen your core muscles and can help reduce inflammation.
  • Try swimming. It can take off some of the pressure, since the buoyancy of the water temporarily relieves the spine of the pregnancy weight.
  • Look into prenatal yoga. "For some patients, sciatica may be relieved by yoga," says Jennifer Wu, M.D., a board-certified OB/GYN with her own private practice, Women's Health of Manhattan, in New York City, and member of the What to Expect Medical Review Board. "The inversion poses can shift the baby temporarily and give some relief to the pressure on the sciatic nerve." Ask your prenatal yoga instructor about any modifications they recommend for moms-to-be.
  • Consider acupuncture, chiropractic adjustments or therapeutic prenatal massage. All can potentially offer relief, just be sure to work with a trained and licensed practitioner. Customized physical therapy regimens can be helpful too. “I suffered from severe sciatica last year and physical therapy was the only thing that really helped,” says user babielotus. I couldn’t walk for more than two minutes without extreme pain. I went to physical therapy twice a week and in addition to some targeted massage, she had me do stretches and light exercises to strengthen the muscles in the surrounding area.”
  • Try to gain pregnancy weight at a steady pace. A sudden jump in pounds could put undue pressure on the sciatic nerve. Your practitioner can recommend how much you personally should gain each trimester. 
  • If the pain is severe, talk to your doctor. They she may recommend acetaminophen in a dosage that will take the edge off the pain but keep you and your baby safe.