Sacroiliac (SI) Joint Pain After Pregnancy: What New Moms Should Know

Many new moms expect some discomfort after childbirth, but persistent pain in the low back, buttock, or pelvic area should not always be brushed off as “normal.”

One possible source is the sacroiliac (SI) joint, which connects the base of the spine to the pelvis. Pregnancy and the postpartum period place major mechanical demands on this area.

During pregnancy, hormonal changes can increase ligament laxity, including around the pelvis. At the same time, posture, gait, abdominal wall function, and load transfer all change. If the muscles and stabilizing systems of the pelvis do not compensate well, pain may develop around the SI joints and surrounding structures.

Typical pain is often felt between the posterior iliac crest and the gluteal fold, often near one or both SI joints. It may also refer to the buttock, posterior thigh, or groin. Many women notice worse pain with standing, walking, rolling in bed, climbing stairs, or carrying the baby for long periods.

The good news is that pregnancy-related pelvic girdle pain often improves after delivery, and prevalence drops significantly within the first few months postpartum. However, some women continue to have persistent pain, especially if symptoms were severe during pregnancy. Ongoing pain that limits sitting, standing, walking, exercise, or caring for a child deserves evaluation.

Accurate diagnosis matters because postpartum pelvic pain is not always from the same structure. It can involve the SI joint, pubic symphysis, lumbar spine, hip, or surrounding muscles. Treatment may include pelvic stabilization work, physical therapy, activity modification, supportive strategies, and in some cases diagnostic or therapeutic injections.

If low back or buttock pain has not improved after childbirth, getting an evaluation can help clarify whether SI joint dysfunction is part of the picture and what options may help you move forward.

⚠ When to Seek Immediate Medical Care

Postpartum back or pelvic pain should be evaluated urgently if it is accompanied by new or worsening leg weakness, significant numbness, loss of bowel or bladder control, fever, or severe rapidly worsening pain. These symptoms may indicate a condition that requires prompt medical attention.

Frequently Asked Questions

Can pregnancy cause SI joint pain? 

• Yes. Hormonal ligament laxity and altered load transfer through the pelvis can contribute to SI-related pain.

Where is postpartum SI joint pain felt?

• Usually in the low back, buttock, or pelvic area near the SI joints, sometimes radiating into the thigh.

When should postpartum pelvic pain be checked?

• If pain persists, limits walking or standing, or is interfering with daily function, it is reasonable to seek evaluation.

Still Experiencing Pelvic or Back Pain After Childbirth?

If tight muscles, trigger points, or recurring pain are interfering with your movement or daily activities, a proper evaluation can help determine what’s actually causing your symptoms.

∘Schedule an evaluation to understand your pain and explore the care options that may help.∘