A Secret Cause To Persistent Shoulder Pain: Long Head Of Biceps

As a Doctor of Physical Therapy practicing in NYC for over 10 years, I see long head of the biceps tendinopathy far more often than most people realize. It’s common in overhead athletes, weightlifters, and active adults—but I also treat plenty of desk workers and parents who develop it from repetitive strain and poor shoulder mechanics.

If you’ve been dealing with nagging pain in the front of your shoulder that worsens with lifting, reaching, or even sleeping on that side, this might sound familiar.

Understanding the Long Head of the Biceps

The biceps has two tendons at the shoulder. The long head runs through a groove in the front of the humerus and attaches inside the shoulder joint. Because of its location, it doesn’t just bend the elbow—it also assists with shoulder stabilization.

That dual role is why this tendon is so often irritated.

In my clinic, long head of biceps tendinopathy usually develops from:

  • Repetitive overhead activity

  • Poor rotator cuff strength

  • Scapular instability

  • Sudden increases in training volume

  • Postural dysfunction (forward shoulder positioning)

Pain is typically localized to the front of the shoulder and may worsen with resisted elbow flexion, supination, or shoulder elevation.

Phase 1: Calm It Down (But Don’t Shut It Down)

One of the biggest misconceptions I see is complete rest.

Tendons don’t respond well to total inactivity. They respond to appropriate loading.

Early rehab focuses on:

  • Reducing aggravating activities (not eliminating all movement)

  • Isometric biceps loading (pain-relieving and tendon-friendly)

  • Gentle rotator cuff activation

  • Scapular stabilization drills

  • Thoracic mobility work

Isometrics are particularly helpful early on. Holding a light elbow flexion contraction for 30–45 seconds can reduce pain through neural mechanisms while still stimulating the tendon.

At this stage, pain should be manageable—typically no higher than 3–4/10 during exercise.

Phase 2: Restore Capacity

Once symptoms are more controlled, we shift from protection to rebuilding.

This is where progressive loading becomes critical.

I introduce:

  • Slow, controlled eccentric biceps exercises

  • Supination strengthening

  • Rotator cuff progressive resistance training

  • Serratus anterior and lower trap strengthening

  • Closed-chain shoulder stability drills

The long head of the biceps does not operate in isolation. If the scapula doesn’t upwardly rotate well or the cuff isn’t centering the humeral head, the tendon continues to take excessive stress.

In many cases, treating the surrounding kinetic chain is what actually resolves symptoms—not just hammering curls.

Phase 3: Return to High Demand Activity

For athletes—especially overhead athletes like baseball players or swimmers—this phase is critical.

Here I focus on:

  • Plyometric shoulder drills

  • High-velocity loading

  • Sport-specific movement patterns

  • Gradual return-to-throwing or overhead progressions

For weightlifters, this might mean reintroducing heavy pulling or pressing in a graded way.

The tendon must tolerate speed and load—not just slow rehab exercises.

What I Tell My Patients

Here’s what consistently matters:

  1. Tendons improve with load, not rest alone.

  2. Pain during rehab does not automatically mean damage.

  3. Strengthening the entire shoulder complex is essential.

  4. Recovery takes time—often 8–12+ weeks for meaningful adaptation.

Cortisone injections may reduce pain short-term, but they do not build tendon capacity. In some cases, they may even impair tendon health if overused.

Surgery is rarely required unless there is significant tearing or persistent dysfunction after exhaustive conservative care.

Common Mistakes I See

  • Aggressive stretching of the anterior shoulder early on; especially with bench press

  • Returning to heavy curls too quickly

  • Ignoring scapular strength

  • Completely avoiding movement

  • Only treating the biceps instead of the whole shoulder

Final Thoughts

Long head of the biceps tendinopathy can be stubborn—but it responds extremely well to structured, progressive rehabilitation.

If you’re dealing with persistent front-of-shoulder pain, don’t just rest it and hope. Get it assessed. Load it properly. Strengthen the system around it.

Your tendon isn’t fragile—it just needs the right stimulus.

Jordan Seda