The Diagnosis Most Women Never Get a Name For: pelvic girdle pain, and the five stretches that actually help.

What pelvic girdle pain actually is

The pelvis is not a single bone. It is three bones — two innominate (hip) bones and the sacrum at the back — joined by three nearly immobile joints: the pubic symphysis at the front, and the two sacroiliac joints at the back. During pregnancy, the hormone relaxin (with contributions from estrogen and progesterone) increases the laxity of the ligaments holding these joints in place. The biomechanical purpose is to allow the pelvis to widen during labor and delivery. The cost — for somewhere between 14% and 22% of pregnancies, according to systematic reviews — is pain.

The pain is typically felt at the pubic bone (with SPD), at the sacroiliac joints in the low back-buttock area, in the inner thighs, or in any combination. It is provoked by activities that load one leg independently of the other: walking, climbing stairs, rolling in bed, getting in or out of a car, lifting a toddler onto a hip. It is often worst in the morning after a still night, easing once the joints warm up, and worsening again at the end of a day on the feet.

The Wermom team's deep-dive at wermom.com/research includes a summary of the COST PGP European consortium consensus and the diagnostic criteria most obstetricians and pelvic physical therapists use to formally name the condition.

Why it is so often dismissed — and why that has changed

For most of the 20th century, pelvic-joint pain in pregnancy was framed as an unavoidable consequence of carrying a baby, not as a diagnosis with a treatment plan. The shift in the last 15 years has been the recognition that the condition responds well to a defined protocol — and that delayed recognition predicts longer postpartum recovery. Women whose PGP is identified and treated during pregnancy are significantly more likely to have full resolution within the first 6 months postpartum than those whose pain is only addressed after delivery.

The current standard in pelvic-floor physical therapy clinics, supported by the APTA Academy of Pelvic Health and reflected in the U.K. NICE antenatal care guidelines, is that any pregnant patient reporting persistent pelvic, hip, or pubic pain deserves referral to a pelvic-floor physical therapist for evaluation. The Wermom editorial team's position is that this referral should be requested by the patient if not offered — the workup is low-cost, low-risk, and frequently transformative.

The biomechanical rules that change daily life

Before any stretching protocol, the most consequential intervention is biomechanical — small adjustments to daily movement that reduce the asymmetrical loading on the pelvic joints. The five that pelvic physical therapists teach first:

Knees together when rolling in bed. The most common moment of severe PGP is rolling from one side to the other at night, because the legs scissor independently. Squeezing a pillow between the knees and rolling as a single unit — knees and shoulders together — reduces the joint shear by a substantial margin.

Both feet down before standing up. Getting out of a car or out of bed using one leg at a time produces the kind of one-sided loading PGP joints cannot tolerate. The fix: swing both legs out together, then stand up with both feet planted.

Symmetrical stair climbing. Climbing stairs one-leg-at-a-time (alternating step) is significantly more loading than climbing two-feet-on-each-step. Going up: lead with the stronger or less painful leg. Going down: lead with the more painful leg, which loads the leg less.

No more than 30 to 45 minutes on the feet without sitting. Standing in line at the grocery, walking the dog, cooking a meal — the cumulative load matters. Pelvic-floor PTs frequently recommend sitting for 5 minutes every 30 to 45 minutes during the third trimester to allow the joints to unload.

Avoid asymmetrical sitting and standing. Sitting cross-legged, standing on one hip with the baby on the other, or sleeping in a posture that twists the pelvis — all reproduce the asymmetrical loading the body cannot accommodate well at this stage.

The five stretches that are evidence-supported in the third trimester

Stretching protocols for PGP differ from generic pregnancy yoga in one important way: the goal is not to increase flexibility in already-hyperlax joints, but to release tight muscular structures around the pelvis that are compensating for the lax ligaments. The five that appear most consistently in the pelvic-floor PT literature:

1. Cat-cow on all fours (5 to 10 slow cycles). Tractions the spine and unloads the SI joints. Hands directly under shoulders, knees under hips. Inhale into a slow arch; exhale into a slow round. Stay within a comfortable range. Useful first thing in the morning.

2. Child's pose with knees wide (1 to 2 minutes). Knees as wide as the mat allows to accommodate the bump; toes touching; sit back toward the heels; arms extended forward. Releases the low back and inner thighs. Stop short of any sharp pubic pain.

3. Supported figure-four hip stretch on the back (30 to 60 seconds each side, only if comfortable on the back). Lie down, place the right ankle on the left thigh just above the knee, gently push the right knee away from the body or pull the left thigh in. Releases the deep hip rotators. In late third trimester, lie on a slight incline (pillows under the upper back) to avoid supine pressure on the vena cava.

4. Side-lying clamshell with band (10 to 15 reps each side). Lie on your side, knees stacked and bent. Lift the top knee while keeping feet together. Strengthens the gluteus medius — the muscle that stabilizes the SI joint during single-leg loading. Add a light resistance band above the knees for progression.

5. Standing wall-supported pelvic tilt (10 reps). Stand with the back against a wall, knees slightly bent, feet hip-width apart. Press the low back into the wall by gently tilting the pelvis under. Hold 3 seconds, release. Engages the deep core and pelvic-floor unit, which together provide the active stabilization the ligaments cannot.

The Wermom editorial position is that this set should be done daily but lightly — 8 to 12 minutes total — and abandoned for the day if any movement provokes sharp pain or worsens symptoms. PGP responds better to consistent low-intensity work than to occasional intensive sessions.

Sleep, the position that breaks 80% of nights

The third trimester's pelvic discomfort and the need to side-sleep (after about 28 weeks the AAP and ACOG recommend left-side or right-side sleeping over back-sleeping for cardiovascular reasons) intersect to make sleep one of the highest-pain hours of the day. The standard positioning, drawn from the pelvic-floor PT consensus:

Lie on the less-painful side. A pillow between the knees that runs from the knees to the ankles — keeping the upper leg parallel to the lower leg rather than dropping toward the bed. A small flat pillow or rolled towel under the bump if the abdominal weight is pulling. A pillow behind the back to prevent rolling. The combination keeps the pelvis in neutral alignment for the eight-hour stretch when the joints would otherwise be loaded asymmetrically.

The Wermom team's third-trimester insomnia guide covers the broader sleep environment changes, and the editorial on postpartum recovery covers what to expect from the pelvis in the first six weeks after delivery.

What changes after delivery

For most women, the relaxin-driven joint laxity normalizes over the first 12 weeks postpartum, and the pelvic pain resolves in parallel. The window for treatment to influence the trajectory is largely in the third trimester and the first 12 weeks postpartum — the period in which the pelvic-floor PT protocols are most effective. Persistent PGP at 6 months postpartum is uncommon but real, affecting roughly 2 to 3% of women, and is the cohort most consistently underserved by routine 6-week postpartum care. The Wermom team's position is that any pelvic-floor pain still present at the 6-week visit deserves a specific referral to pelvic-floor physical therapy rather than a "give it more time" response.

The shorter answer, for the patient at 32 weeks holding her hip

If you are in the third trimester and the pain at the pubic bone, hip, or low back has begun to interfere with walking, rolling in bed, or sleeping — that is pelvic girdle pain, and it deserves a name and a referral. The first-line management is biomechanical (knees together rolling, both feet down standing up, no one-leg-at-a-time stairs), a support belt for symptomatic relief, side-sleep positioning with a knee pillow, and a daily 10-minute set of targeted stretches. Pelvic-floor physical therapy referral is the single highest-yield intervention. The pain does not have to be tolerated as the cost of pregnancy. For the editorial mission behind the Wermom team's pregnancy guidance and the OB-GYNs who shape it, see our editorial principles.