Why Posterior Rib Cage Expansion Matters More Than You Think
Physical Therapy Holly Springs, NC
Nicole Perna PT, DPT
Evolve Physical Therapy
When most people think about breathing, they picture their chest rising and falling. But healthy
breathing is much more than that. One of the most overlooked aspects of breathing is posterior
rib cage expansion. Believe it or not, how well your back ribs move can influence everything
from neck and shoulder pain to low back pain, core stability, athletic performance, and even
pelvic floor function.
What Is Posterior Rib Cage Expansion?
Take a deep breath and notice where you feel the movement.
Do your shoulders lift?
Does your chest puff forward?
Or do you feel your rib cage gently expand into your sides and back?
Your rib cage is designed to expand in 360 degrees. That means your ribs should move not only
forward but also sideways and backward. The posterior (back) ribs are responsible for a large
portion of this expansion. When the back of the rib cage doesn't move well, your body has to
find another way to breathe and that often leads to unnecessary tension and compensation.
As a pelvic floor physical therapist, one of the first things I assess is breathing because your
diaphragm and pelvic floor work as a team.
When you inhale, your diaphragm descends and your pelvic floor naturally lengthens and
relaxes. As you exhale, both muscles gently recoil upward.
If your ribs aren't expanding well especially into the back your diaphragm may not move
efficiently. That can contribute to:
● Pelvic floor tension
● Difficulty relaxing the pelvic floor
● Urinary leakage
● Pelvic pain
● Constipation
● Core weakness
● Feelings of pressure or heaviness
Limited posterior rib expansion can also contribute to neck and shoulder pain, low back pain,
core weakness and decreased athletic performance.
At physical therapy, we look at why your rib cage isn't moving well.
Treatment may include:
● Thoracic spine mobility exercises
● Rib cage mobility techniques
● Breathing retraining
● Core coordination exercises
● Pelvic floor muscle training
● Postural education
● Manual therapy when appropriate
The goal isn't to force bigger breaths, it's to restore efficient movement so your body can
breathe the way it was designed to
If you've been dealing with pain, pelvic floor symptoms, or persistent tightness that just won't go
away, your breathing mechanics may be a missing piece of the puzzle. Restoring posterior rib
cage expansion is often one of the simplest and most impactful places to start.










