Why Does My Shoulder Hurt When I Throw a Football?

Fall means football season, and it also means a predictable uptick in one particular shoulder complaint: pain specifically during the throwing motion, often felt deep in the back of the shoulder rather than the front. It doesn't necessarily hurt reaching overhead for a cabinet or lifting something at the gym. It hurts specifically when you cock your arm back and throw — which is exactly the clue that points toward what's actually going on.

Throwing shoulder pain isn't the same problem as the sustained-position shoulder strain you'd see in, say, a musician holding an instrument for hours. This is a different mechanism entirely — explosive, high-velocity, and concentrated in one specific phase of the throwing motion — and it demands a different explanation and a different treatment approach.

Shoulder pain from throwing typically results from internal impingement — a condition where the rotator cuff tendon and the shoulder labrum get pinched between the head of the humerus and the back of the shoulder socket during the "late cocking" phase of throwing, when the arm is maximally rotated backward. This mechanism is well-documented in throwing athletes and is often accompanied by tightness in the back of the shoulder capsule and weakness in specific rotator cuff muscles. Addressing both the tightness and the weakness together is typically necessary for meaningful, lasting improvement.

Here's what's actually happening during that throwing motion, and why treatment needs to address more than just "rest and ice."

Why Does My Shoulder Hurt When I Throw a Football?:

What Actually Happens in Your Shoulder During a Throw

The throwing motion has distinct phases, and the "late cocking" phase — where your arm is raised out to the side and rotated backward, right before you accelerate the ball forward — is where the real mechanical stress concentrates.

In this position, research has consistently identified a specific mechanism called internal impingement: the underside of the rotator cuff tendon (typically the supraspinatus and infraspinatus) gets compressed against the back of the shoulder socket and the labrum — the ring of cartilage that lines and stabilizes the joint.[^1] This isn't necessarily abnormal in small amounts — some contact between these structures happens even in healthy throwing shoulders — but when it becomes excessive or repetitive beyond what the tissue can tolerate, it becomes a genuine source of injury.[^2]

Over time and repeated throwing, this mechanism can contribute to a specific pattern researchers call "peel-back" — where the labrum begins to separate from its normal attachment at the top of the socket, sometimes progressing to what's known as a SLAP tear (superior labrum anterior to posterior).[^1] It can also contribute to partial-thickness tears in the rotator cuff tendon itself.

Why This Happens: The Contributing Factors Behind Internal Impingement

A few specific, well-documented factors tend to set the stage for this mechanism becoming problematic.

Tightness in the back of the shoulder capsule — often described as GIRD, or glenohumeral internal rotation deficit — is one of the most consistently identified contributors. When the back of the capsule is tight, it subtly shifts how the humeral head sits and moves within the socket, increasing the amount of impingement that occurs during the late cocking position.[^3]

Rotator cuff muscle imbalance plays a direct role too. Research using cadaveric shoulder specimens found that imbalances in rotator cuff muscle strength directly influenced the degree of forceful internal impingement and labral peel-back during simulated throwing positions — meaning this isn't just a passive anatomical issue, but one that's actively influenced by how well specific muscles are functioning.[^4]

Kinetic chain breakdown is a piece that's genuinely underappreciated outside of sports medicine circles. Throwing isn't purely a shoulder movement — it's a whole-body sequence that transfers force from the legs and trunk up through the shoulder and arm. Research has found that throwers with labral tears commonly show inflexibility through the back and hips, along with weakness in specific shoulder stabilizer muscles and core weakness — meaning the shoulder is sometimes absorbing extra stress because the rest of the throwing chain isn't doing its share of the work.[^5]

Why This Is Genuinely Different From Other Shoulder Overuse Patterns

It's worth being specific about this distinction, because generic shoulder rehab that doesn't account for the throwing-specific mechanism tends to underperform. This isn't the sustained, endurance-based demand seen in something like prolonged overhead instrument playing, where the issue is largely about a shoulder maintaining a moderately elevated position for extended periods. Throwing is explosive and high-velocity, concentrated in a narrow window of the motion, and the internal impingement mechanism specifically involves the back of the shoulder and the labrum — a genuinely different injury pattern requiring genuinely different treatment emphasis.

What Assessment Actually Looks At

Evaluation starts with understanding exactly when in the throwing motion pain occurs — during the cocking phase specifically, during acceleration, or during follow-through — since timing provides real clues about which structures are most involved.

From there, we assess internal and external rotation range of motion specifically, looking for the GIRD pattern that's so consistently linked to this mechanism. We test rotator cuff strength in detail, since imbalances here directly influence impingement severity. We assess scapular positioning and control, since poor shoulder blade mechanics contribute to the overall picture. And we look at the broader kinetic chain — hip and trunk mobility and strength — since deficits there can be quietly loading the shoulder with more work than it should be doing alone.

What Treatment Actually Involves

Treatment for throwing-related internal impingement generally centers on restoring posterior capsule mobility through specific stretching aimed at that back-of-shoulder tightness, since this is one of the more directly modifiable contributors to the impingement mechanism itself.[^6]

Rotator cuff strengthening addresses the muscle imbalances that influence how much impingement occurs during throwing, with particular attention to the muscles that showed weakness on assessment rather than a generic strengthening routine.

Scapular stabilization training improves how the shoulder blade positions and moves during the throwing motion, which affects how much stress reaches the rotator cuff and labrum.

Addressing the kinetic chain — hip mobility, trunk stability, and overall throwing mechanics — is a genuinely important piece that's easy to overlook if treatment focuses on the shoulder in isolation.

Throwing volume and intensity typically get modified during the early phase of treatment, with a structured, gradual return to full throwing as strength, mobility, and mechanics improve, rather than continuing to throw through pain while other treatment happens.

When It's Worth Getting This Looked At

Worth scheduling an evaluation if: shoulder pain specifically occurs during throwing (particularly during the cocking or acceleration phase), you've noticed reduced velocity or control that seems related to shoulder discomfort, pain has persisted for more than a couple of weeks, or you want a proactive assessment before pain develops during football season.

Common Questions About Throwing Shoulder Pain

Is this the same as a rotator cuff tear?

Not necessarily — internal impingement can occur with or without an actual tear, and can progress toward one if the underlying mechanism isn't addressed, but plenty of throwing shoulder pain resolves with conservative treatment before reaching that point.

Do I need to stop throwing completely?

Often, activity modification rather than complete cessation is appropriate early in treatment, with a structured return to full throwing as the underlying factors are addressed.

What is GIRD, and why does it matter so much?

Glenohumeral internal rotation deficit refers to reduced internal rotation range of motion in the throwing shoulder, typically from posterior capsule tightness, and it's one of the most consistently identified contributors to the internal impingement mechanism.

Could this actually be a labral tear already?

It's possible, particularly with more significant or longer-standing symptoms — assessment helps determine whether findings suggest a labral injury is likely, and whether further imaging would be useful.

Is surgery ever necessary for this?

Nonoperative treatment — addressing mobility, strength, and mechanics — is the appropriate starting point for the vast majority of cases, with surgery generally reserved for more significant structural injuries that don't respond to a genuine trial of conservative care.

Does this only happen to quarterbacks, or can other positions get it too?

Any position involving repetitive throwing is at risk, though quarterbacks with high throw volume are a common example given how frequently the motion is repeated.

How long does treatment typically take?

This varies by severity, but many throwers notice improvement within several weeks of addressing the specific contributing factors, with continued progress as strength and mobility rebuild.

Can this be prevented before it becomes painful?

Yes — addressing posterior capsule mobility, rotator cuff balance, and kinetic chain function proactively, before pain develops, is a reasonable approach for anyone throwing regularly.

Why Does My Shoulder Hurt When I Throw a Football?: Bottom Line

Shoulder pain during throwing is usually driven by a specific, well-documented mechanism called internal impingement, where the rotator cuff and labrum get compressed during the late cocking phase of the throw — often worsened by posterior shoulder tightness, rotator cuff muscle imbalance, and breakdowns elsewhere in the throwing kinetic chain. This is a genuinely different injury pattern from other types of shoulder overuse, and effective treatment addresses the specific throwing-related factors driving it rather than generic shoulder rehab.

Shoulder pain affecting your throwing this season?

Schedule a Physical Therapy Evaluation at Nashville Physical Therapy & Performance. You'll get completely 1:1 care with your therapist for the entire visit — no aides, no split attention. We'll assess your throwing mechanics, shoulder mobility, and strength to identify exactly what's driving your pain. Available at East Nashville, West Nashville/The Nations, Brentwood, and our new Goodlettsville location, opening October 5 with both orthopedic and pelvic floor services. Call 615-428-9213 or book online at nashvillept.com.

References

[^1]: A Review on a Common Cause of Shoulder Pain in Throwers. Sports Health. 2010.

[^2]: Shoulder Impingement (Internal). Physiopedia.

[^3]: Rotator Cuff Syndrome. StatPearls. National Center for Biotechnology Information. 2024.

[^4]: Effect of rotator cuff muscle imbalance on forceful internal impingement and peel-back of the superior labrum: a cadaveric study. American Journal of Sports Medicine. 2009.

[^5]: Management of the Throwing Shoulder: Cuff, Labrum and Internal Impingement. Musculoskeletal Key / orthopedic sports medicine reference. 2011.

[^6]: Internal Shoulder Impingement. Orthopedic clinical treatment reference. 2026.