Pregnancy rib pain is extremely common in the third trimester, typically starting around week 28, and it responds well to a combination of positioning changes, gentle stretching, and simple at-home strategies. The pain ranges from a dull ache along the lower ribs to sharp, stabbing sensations that worsen with sitting or deep breathing. It almost always resolves after delivery, but in the meantime, there’s a lot you can do to manage it.
Why Your Ribs Hurt During Pregnancy
Several things converge on your rib cage at once during the third trimester. Your body produces a hormone called relaxin, which loosens muscles, joints, and ligaments so your uterus can expand. That loosening doesn’t just affect your pelvis. It also makes the connective tissue between your ribs more flexible, allowing the rib cage itself to widen. Your lungs compensate for a rising diaphragm by increasing rib cage expansion with each breath, which puts additional mechanical stress on already-loosened joints.
Meanwhile, your growing uterus pushes upward against the bottom of the rib cage, compressing the lowest ribs directly. If your baby is in a breech position (feet down), you may feel a hard lump pressing right against your ribs where the head sits high. Even in a head-down position, feet and knees can kick into the underside of your ribs with surprising force.
In some cases, the nerves that run between the ribs get stretched or compressed as the rib cage expands and abdominal muscles shift. This is called intercostal neuralgia, and it produces a sharper, more burning type of pain that can wrap around from your back to your front along a single rib. The lower intercostal nerves, running roughly from the mid-back around to the front of the abdomen, are especially vulnerable because they make a sharp turn where they pass through the abdominal muscles, creating a natural pinch point.
Positions That Take Pressure Off
The single most effective change is getting your baby’s weight off your diaphragm and lower ribs. When you’re sitting, avoid slouching or reclining, both of which compress the rib cage. Sit tall with your shoulders back, and if possible, use a chair with good lumbar support so your spine stays long. Some women find that sitting backward on a chair (straddling it with arms resting on the back) opens the rib cage immediately.
For sleeping, lie on your side (left is often recommended for circulation, but either works for rib pain) with a pillow between your knees and another tucked under your belly. If one side hurts more than the other, sleep on the opposite side. Placing a pillow or rolled towel under the painful side of your rib cage can also prevent compression while you sleep. Propping yourself at a slight incline with extra pillows sometimes helps if lying flat makes the pain worse.
Stretches That Ease Rib Tightness
Gentle stretching can relieve both the muscular tension and the nerve compression that contribute to rib pain. Start slowly, aiming for up to 10 repetitions per stretch as it feels comfortable.
Side stretch: Stand with your feet hip-width apart. Raise one arm overhead and lean gently to the opposite side until you feel a stretch along your ribs. Hold for a few seconds, then switch sides. This directly opens the intercostal spaces where nerves and muscles are compressed.
Cat-cow stretch: Start on your hands and knees with your head in line with your back. Pull your stomach in and round your back slightly, holding for several seconds. Then relax your stomach and let your back flatten (don’t let it sag downward). This mobilizes the joints where your ribs connect to your spine.
Child’s pose (backward stretch): From hands and knees, keep your arms straight and curl backward toward your heels as far as is comfortable for your knees. Tuck your head toward your knees with arms extended and hold for several seconds. You can also do this with a fitness ball in front of you, placing your hands on the ball and curling back. This lengthens the entire back and creates space between the ribs.
Doorway chest opener: Stand in a doorway with your forearms resting on each side of the frame at shoulder height. Step one foot forward gently until you feel a stretch across your chest and the front of your ribs. Hold for 15 to 30 seconds. This counteracts the forward rounding that compresses the front of the rib cage.
Other Relief Strategies
A warm (not hot) compress applied to the sore area for 15 to 20 minutes can relax tight intercostal muscles. Some women alternate with a cold pack wrapped in a cloth if there’s inflammation. A warm bath works similarly, and the buoyancy of water temporarily takes weight off the rib cage entirely.
Loose clothing matters more than you might expect. Anything with a band under the bust, including some maternity bras, can dig into already-irritated ribs. Switching to a soft, wireless bralette or a bra extender can make a noticeable difference. Belly support bands that lift the uterus from below may reduce the upward pressure on your ribs, though some women find bands uncomfortable and prefer going without.
Breathing exercises help when rib pain makes you feel like you can’t take a full breath. Place your hands on the sides of your rib cage and breathe slowly, focusing on pushing your ribs outward into your hands rather than lifting your shoulders. This “lateral breathing” pattern uses the rib cage more efficiently and can reduce the feeling of tightness.
Pain Relief With Medication
Acetaminophen (Tylenol) is considered safe at all stages of pregnancy in standard doses and has been studied in thousands of pregnant women without increased risk of birth defects or other adverse outcomes. It’s the first-line option for rib pain that doesn’t respond to stretching and positioning alone.
Ibuprofen and other anti-inflammatory medications (NSAIDs) are a different story. While studies haven’t shown consistent evidence of harm in the first trimester, using NSAIDs after 32 weeks carries a real risk of causing a blood vessel in the baby’s heart to close prematurely. Since rib pain peaks in the third trimester, this means NSAIDs are off the table exactly when you need them most. Stick with acetaminophen at the lowest dose that helps.
When Rib Pain Signals Something Serious
Most pregnancy rib pain is mechanical and harmless, but pain specifically under the ribs on the right side deserves extra attention. This is where your liver sits, and upper right abdominal pain is one of the hallmark symptoms of preeclampsia and a related condition called HELLP syndrome, both of which can become dangerous quickly.
Take right-sided rib pain seriously if it comes with any of the following: a severe headache that won’t go away, visual changes like blurriness or light sensitivity, sudden swelling of the face or hands, nausea and vomiting in the second half of pregnancy, or decreased urination. Blood pressure readings at or above 140/90 are another red flag. These symptoms together point to a problem that needs immediate medical evaluation, not a wait-and-see approach.
Rib pain that feels like a sudden, sharp crack (rather than a gradual ache) could rarely indicate a stress fracture, particularly if you have risk factors for bone loss. And pain accompanied by fever or redness along the rib area may suggest an infection or inflammation unrelated to normal pregnancy changes.
When the Pain Will Stop
For most women, rib pain eases in the last two to four weeks of pregnancy as the baby drops lower into the pelvis in preparation for delivery. This “lightening” shifts the pressure downward, which is why many women say they can suddenly breathe more easily near the end. After delivery, the mechanical cause disappears, and the pain typically resolves within days to weeks. Relaxin levels take longer to return to normal, so some residual rib cage looseness can linger for a few months postpartum, but the pain itself rarely does.