Discover how rib cage dysfunction and thoracic mobility limitations contribute to chronic shoulder pain and learn evidence-based strategies to address the root biomechanical causes.

Why Your Shoulder Pain Might Actually Be a Rib Cage Problem

You’ve worked on the shoulder. But have you looked at what the shoulder sits on?

As an athlete, nagging shoulder pain can be incredibly frustrating—especially when you feel like you’ve already tried everything.

Rotator cuff exercises. Stretching. Mobility work. Maybe injections or other treatments.

You may have even worked your way through every shoulder exercise you could find on YouTube and still aren't improving.

So what if the shoulder isn't the whole problem?

Sometimes, we need to look at the rib cage and thoracic spine.

Your shoulder blade (scapula) sits directly on your rib cage. The position and movement of your rib cage and mid-back can influence how that shoulder blade moves—and ultimately how your shoulder functions during reaching, throwing, swimming, pressing, and other athletic movements.

Think of your rib cage as part of the foundation for your shoulder.

You wouldn't keep working on the roof of a house without checking the foundation underneath it.

The same idea can apply to shoulder rehabilitation.

The Rib Cage & Shoulder Connection

Here are four reasons we look beyond the shoulder when assessing persistent shoulder problems.

1. Your Shoulder Blade Has to Move on Your Rib Cage

Your scapula doesn't operate independently. It has to glide and rotate along the surface of your rib cage as your arm moves.

If the thorax isn't moving well—or you're having difficulty controlling the scapula relative to it—the mechanics of reaching overhead can change.

That can increase the demands placed on the shoulder and rotator cuff.

Sometimes the problem isn't simply a “weak rotator cuff.” We need to understand the platform it's working from.

2. Thoracic Mobility Matters

Try reaching overhead while sitting in a heavily rounded position.

Now sit taller, extend through your upper back, and try again.

Feel the difference?

Your thoracic spine contributes to your ability to get your arm overhead efficiently.

When that motion is limited, your body still has to find a way to accomplish the task. You may compensate by excessively arching your lower back, changing the position of your shoulder blade, or finding motion somewhere else.

For an athlete performing hundreds of repetitions, those compensations can matter.

3. Don't Forget About Breathing

Your rib cage isn't a rigid structure. It's designed to move with every breath.

The diaphragm, ribs, abdominal wall, and surrounding musculature all contribute to the way your trunk manages pressure and position.

For some athletes, addressing breathing mechanics can be a useful part of restoring rib cage movement and creating better options for the shoulder blade to move.

That's why you may occasionally see us working on breathing during a shoulder rehabilitation program.

No, we haven't forgotten about your shoulder.

We're working on the system around it.

4. Your Shoulder Is Part of a Bigger Movement System

Throwing a baseball, hitting a tennis serve, swimming, performing a pull-up, or putting weight overhead isn't just a shoulder movement.

Force has to travel through the body.

Your legs, pelvis, trunk, rib cage, shoulder blade, and arm all have to work together.

That's particularly important for athletes in rotational and overhead sports such as:

• Baseball
• Tennis
• Swimming
• Golf
• CrossFit
• Olympic lifting
• Volleyball
• Pickleball

When we evaluate shoulder pain, we're interested in more than “Where does it hurt?”

We also want to know:

“What is the rest of the body doing when you ask the shoulder to perform?”

Could Your Rib Cage or Thoracic Spine Be Part of the Problem?

A proper assessment is the best way to determine what's actually contributing to your symptoms, but there are a few things that may warrant looking beyond the shoulder itself:

• Difficulty reaching fully overhead
• Excessive lower-back arching when reaching overhead
• Limited trunk rotation, particularly to one side
• Persistent chest or mid-back tightness
• Difficulty moving or controlling your shoulder blade
• Symptoms that haven't responded as expected to shoulder-only exercises
• Pain around the shoulder blade or upper back
• A noticeable difference in movement from one side to the other

These signs don't automatically mean “your ribs are out” or that your rib cage is the cause of your pain.

They simply tell us that the thoracic spine, rib cage, and surrounding movement system may deserve a closer look.

3 Exercises to Explore

These are three exercises we commonly use to work on thoracic movement, rib cage mechanics, and shoulder control.

They aren't a universal prescription for shoulder pain, but they can be useful starting points for the right person.

1. Thoracic Cobra to Swimmer

This exercise combines thoracic extension with overhead shoulder and scapular control.

How to do it:

1. Lie on your stomach.
2. Press your upper body away from the floor while trying to create movement through your upper and mid-back rather than simply extending your lower back.
3. From there, perform a controlled circular arm motion.
4. Focus on keeping your arms away from the floor and controlling your shoulder position throughout the movement.

Try: 2 sets of 10 lifts followed by 5 swimmers.

[WATCH: Thoracic Cobra to Swimmer]

2. Open Books

Open Books are a simple way to work on rotational mobility through the thoracic spine and rib cage.

How to do it:

1. Lie on your side with your hips and knees bent and your knees stacked.
2. Extend both arms straight in front of you with your hands together.
3. Slowly rotate your top arm away from the bottom arm, opening your chest toward the opposite side.
4. Follow your hand with your eyes.
5. Keep your knees together and avoid allowing the top leg to follow the rotation.
6. Exhale as you rotate.

Try: 8–10 repetitions per side.

[WATCH: Thoracic Rib Pull / Open Book]

3. 90/90 Hip Lift

This exercise can be a useful way to work on rib cage position, breathing, and trunk control.

How to do it:

1. Lie on your back with your feet supported on a wall or bench and your hips and knees at approximately 90 degrees.
2. Gently pull your heels down into the support.
3. Slightly tuck your pelvis and allow your hips to hover just off the floor.
4. Place a pillow or ball between your knees and gently squeeze.
5. Take slow breaths, emphasizing a long, complete exhale.
6. Keep the movement controlled rather than turning it into a hard bridge.

Try: 8 slow breaths.

[WATCH: 90/90 Hip Lift]

The Bigger Lesson

If you've been treating your shoulder over and over again without getting the result you expected, don't automatically assume you need another shoulder exercise.

The shoulder doesn't work in isolation.

Sometimes improving shoulder function means looking at the rib cage underneath it, the thoracic spine behind it, the trunk below it, and the way all of those pieces interact during your sport.

Don't just treat where it hurts. Understand how it moves.

A comprehensive assessment can help determine whether your shoulder itself is the primary issue—or whether something elsewhere in the movement system is contributing to the problem.

Exercises are provided for general educational purposes and are not a substitute for an individualized medical evaluation. If you have significant pain, weakness, numbness, tingling, symptoms extending down the arm, or symptoms that are worsening or not improving, seek evaluation from an appropriate healthcare professional.