Rib pain during pregnancy is common in the late second and third trimesters, and simple changes to how you sit, sleep, and move can make a real difference. The discomfort usually peaks between weeks 28 and 36, then eases when the baby drops lower into your pelvis in preparation for birth. While you wait for that natural relief, there are several practical ways to reduce the pressure on your ribs day and night.
Why Your Ribs Hurt During Pregnancy
As your uterus expands upward to accommodate your growing baby, it pushes into the space your ribs and diaphragm normally occupy. Near the end of the second trimester, most babies flip head-down, pointing their feet toward your ribs. From that position, kicks and stretches land directly on your lower rib cage. The pain tends to be sharper on one side, depending on how the baby is positioned.
The extra weight you’re carrying also strains the muscles around your abdomen, which connect to and support your rib cage. As those muscles stretch and fatigue, they pull on the rib area and contribute to a dull, persistent ache. Hormonal changes loosen the ligaments between your ribs as well, making the joints there less stable and more sensitive to pressure.
Posture and Sitting Adjustments
Slouching compresses your rib cage and gives your baby even less room, which intensifies the pain. Sitting tall with your shoulders back creates more vertical space between your pelvis and ribs. If you work at a desk, adjust your chair height so your hips are slightly higher than your knees, and place a small cushion or rolled towel behind your lower back for support.
When the pain flares, try a simple stretch: raise both arms overhead and gently lean to the side opposite the pain. Hold for 15 to 20 seconds, breathing deeply. This opens up the rib cage on the compressed side. Repeating this a few times throughout the day can prevent the muscles from tightening up.
Sleeping Positions That Help
Nighttime rib pain is one of the most frustrating parts, since lying down shifts the baby’s weight in unpredictable ways. Sleeping on your left side with strategic pillow placement tends to work best. Place a pillow between your knees to align your hips and lower back, reducing strain on your pelvis. Tuck another pillow under your belly to support its weight and prevent it from pulling on your upper body.
If the rib pain is worse on one side, try sleeping on the opposite side so gravity pulls the baby slightly away from the sore ribs. Elevating your head and shoulders with an extra pillow or a wedge can also help, especially if rib pressure is making it hard to breathe deeply. A full-length pregnancy pillow can serve all these functions at once and keep you from rolling onto your back during the night.
Using a Belly Band for Support
A maternity belly band wraps around your lower abdomen and distributes the weight of the baby more evenly across your back and core. By lifting some of the load off your abdominal muscles, it reduces the upward pull on your rib cage. Belly bands also provide external cues that encourage better posture, which in turn keeps your ribs from compressing.
Keep wear time to two to three hours at a stretch. Wearing one too long can lead to overdependence, meaning your core muscles do less work and weaken over time. Pairing belly band use with gentle core-strengthening exercises, like deep belly breathing and pelvic tilts, helps maintain muscle support throughout your pregnancy. Avoid belly bands if you have circulation issues or blood pressure concerns, since too much compression on the abdomen can affect blood flow and worsen heartburn.
Clothing and Bra Fit
A bra that fit perfectly in your first trimester can become a source of rib pain by the third. Your rib cage expands during pregnancy, sometimes by several inches, so a too-tight band digs into already-sensitive tissue. Switch to a wireless maternity or nursing bra with a wider band and adjustable closure. The goal is gentle support for your growing breasts without any constriction around your ribs.
The same principle applies to any clothing with a fitted waistband or structured bodice. Loose, stretchy fabrics around your midsection allow your ribs to expand naturally with each breath. Even a sports bra that’s slightly too snug can make rib pain noticeably worse during exercise.
Movement and Stretching
Gentle movement keeps the muscles around your ribs from stiffening. Prenatal yoga is particularly effective because many poses focus on opening the chest and side body. Cat-cow stretches on all fours relieve pressure by shifting the baby’s weight forward, away from your ribs. Swimming and walking also help by encouraging the baby to shift position without any jarring impact.
Massage around the hips and glutes can create space in your pelvis, encouraging the baby to settle lower and take pressure off your rib cage. You can do this yourself with a foam roller or tennis ball against a wall, or ask a partner to apply gentle pressure to the muscles on either side of your lower spine. A prenatal massage therapist can target these areas more precisely if the pain is persistent.
When the Pain Eases on Its Own
After about 36 weeks, the baby typically drops deeper into your pelvis in a process called “lightening.” This shift can bring dramatic relief to your ribs, sometimes almost overnight. First-time pregnancies tend to experience lightening earlier, while subsequent pregnancies may not see it until closer to labor. Once the baby drops, you may find it easier to breathe and eat full meals again, though pelvic pressure and the need to urinate frequently will increase.
Pain That Needs Attention
Most pregnancy rib pain is muscular and positional, but upper abdominal pain under the ribs on your right side can signal preeclampsia or a related condition called HELLP syndrome. These are serious complications that require immediate medical evaluation. The key differences: preeclampsia-related pain is typically constant rather than movement-related, and it comes with other symptoms like severe headaches, vision changes (blurriness, light sensitivity, or temporary vision loss), swelling in the face or hands, nausea, and decreased urination. If your rib pain is accompanied by any of these, contact your provider right away rather than trying to manage it at home.