Shoulder Pain with Exercise: The Most Common Causes and How to Fix Them

Shoulder pain with exercise is one of the most common complaints we see at Swift PT and Performance. It shows up in overhead athletes like swimmers, throwers, and volleyball players, as well as in recreational lifters. The good news: most shoulder pain has identifiable, treatable causes — and doesn't require surgery or months on the sideline to resolve.

Why the Shoulder Is Vulnerable

The shoulder is the most mobile joint in the human body — and that mobility comes at the cost of stability. Unlike the hip, the shoulder sits in an extremely shallow socket. Stability is provided almost entirely by soft tissue: the rotator cuff muscles, labrum, and capsule. When any of these structures are overloaded or deficient, pain follows.

The Most Common Causes of Shoulder Pain in Athletes

1. Rotator Cuff Tendinopathy

The rotator cuff is a group of four muscles that control rotation and stabilize the humeral head in the socket. Repetitive loading — particularly with overhead movements, throwing, or pressing — can cause tendinopathy that presents as pain with activity, weakness, and difficulty reaching overhead or behind the back.

2. Shoulder Impingement Syndrome

Impingement occurs when soft tissue structures in the subacromial space are compressed during shoulder elevation. Athletes describe a painful arc, typically between 60 and 120 degrees of arm raise. Impingement is almost always a movement and strength problem — poor scapular control, rotator cuff weakness, and thoracic stiffness are the most common drivers.

3. Labral Tears (SLAP Lesions)

The labrum deepens the shoulder socket. SLAP tears are particularly common in overhead throwing athletes — pitchers, quarterbacks, swimmers. Symptoms include deep joint pain, a clicking or catching sensation, and pain with rotational movements and overhead activity.

4. AC Joint Pain

The acromioclavicular joint sits at the top of the shoulder. AC joint pain is common in contact sport athletes and heavy lifters, typically presenting as localized pain at the top of the shoulder that worsens with pressing movements and cross-body reaches.

5. Biceps Tendinopathy

The long head of the biceps tendon attaches inside the shoulder joint and is commonly involved in overhead athletes and lifters. It presents as anterior shoulder pain that worsens with lifting, carrying, and supination movements.

What Does NOT Cause Most Shoulder Pain

One of the most important things to understand: MRI findings are often not the cause of pain. Multiple studies have shown that rotator cuff tears, labral fraying, and degenerative changes are common in pain-free athletes. Imaging findings should always be interpreted in clinical context — abnormal MRI findings do not automatically indicate a surgical problem.

How Shoulder Pain Is Treated

The vast majority of shoulder pain in athletes responds well to physical therapy. Treatment focuses on:

• Identifying the movement dysfunction driving the problem — scapular control, rotator cuff activation, thoracic mobility

• Progressive loading of the involved tissue — tendons respond to load, not rest

• Manual therapy to restore joint mobility and reduce tissue restriction

• Sport-specific exercise progressions that restore full overhead and rotational function

• Education on load management to avoid re-aggravation

When to Seek Help for Shoulder Pain

Don't train through shoulder pain indefinitely. Seek evaluation if:

• Pain has persisted for more than 2–4 weeks

• Strength is noticeably diminished

• Pain is waking you up at night

• You've had a traumatic event — fall, collision, or sudden onset of sharp pain

• The joint feels unstable or like it 'slipped out'

Shoulder Pain Treatment at Swift PT and Performance, Hamilton NJ

At Swift PT in Hamilton, NJ, we specialize in athletic shoulder injuries. Every patient receives a comprehensive movement assessment, sport-specific strength testing, and a treatment plan built around their activity demands — not a generic protocol. Book a free 30-minute discovery call at swiftptandperformance.com or call (609) 954-4765.