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Week 40 · Third Trimestermild

Rib Pain at 40 Weeks Pregnant

Rib pain is very common in the third trimester as the growing uterus pushes up against the rib cage. Baby kicks to the ribs and diaphragm can cause sharp, brief pain.

👶 What's Happening at Week 40

Your baby is now the size of a small pumpkin.

  • The baby is fully developed and ready for life outside the womb.
  • Lungs are producing enough surfactant for independent breathing.
  • The skull bones are soft and can mold for passage through the birth canal.

🔬 Why You're Experiencing Rib Pain at Week 40

  • Expanding uterus pushes upward against the lower ribs and diaphragm
  • Baby's kicks and movements directly impact the ribs and intercostal muscles
  • Rib cage flares outward to accommodate expanding lungs and uterus
  • Postural changes and rounded shoulders increase rib cage tension
  • The intercostal muscles (between the ribs) stretch and become more sensitive

💊 Relief Tips for Week 40

1
Good PostureSitting tall with shoulders back creates more space in the chest cavity and reduces rib compression.
2
Change PositionsIf baby is lodged against your ribs, changing position (moving, rolling over, or a gentle nudge) often shifts the baby.
3
Raise Your Arms OverheadStretching arms up momentarily creates more space in the torso and can relieve rib pressure.
4
Avoid SlouchingSlouching compresses the space between the uterus and ribs, worsening discomfort.
5
Warm CompressA warm compress on the affected rib area can ease muscle tension.

📋 Other Week 40 Symptoms

Extreme pelvic pressureStrong Braxton Hicks or early laborCervical dilationExhaustion and impatienceLoose stools
See full Week 40 guide →

⚠️ Call Your Doctor If…

  • Severe rib pain with upper right abdominal pain — possible HELLP syndrome or liver involvement
  • Rib pain with headache, swelling, and vision changes — possible preeclampsia
  • Sudden, severe chest or rib pain with difficulty breathing
  • Rib pain after a trauma or fall

Frequently Asked Questions

Why does my baby kick me in the ribs so much?

In the third trimester, the baby has less room and their feet often end up tucked under the mother's ribs. Kicks can be very forceful in this position.

Can pregnancy cause rib fractures?

True rib fractures from uterine pressure are extremely rare. Rib pain in pregnancy is almost always soft-tissue and muscle-related.

When does rib pain start in pregnancy?

It most commonly begins in the third trimester (weeks 28–40) as the uterus reaches the level of the rib cage.

Does rib pain go away when the baby drops?

Yes — when the baby's head engages in the pelvis (lightening), upward pressure on the ribs and diaphragm is relieved, often improving rib pain and breathing.

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult your OB/GYN or midwife about symptoms during pregnancy.