01/13/2026
Pain in Your Shoulder? It Could Be Tendonosis (or More)
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Shoulder pain is one of the most common musculoskeletal complaints we see. And yet, it’s often misunderstood. The shoulder is a complex joint, made up of bones, muscles, tendons, ligaments, and nerves — all working together to allow an incredible range of motion.
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Because of this complexity, pinpointing the source of pain can be tricky. Many people assume it’s “just a stiff shoulder” or “overuse,” when in fact it could be something more specific, like tendonosis, tendonitis, joint irritation, or even a labral tear.
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The Shoulder Complex: Key Structures
1. Rotator Cuff Muscles
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The rotator cuff is a group of four muscles — supraspinatus, infraspinatus, teres minor, and subscapularis — that stabilize the shoulder joint and control lifting and rotation of the arm.
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Rotator cuff tendonitis / tendonosis occurs when these tendons are overused or irritated. Pain is often felt on the top or outside of the shoulder, sometimes radiating down the arm.
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2. Biceps Tendon
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The long head of the biceps tendon runs through the front of the shoulder and helps stabilize the joint.
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Biceps tendonitis / tendonosis can cause pain in the front of the shoulder, especially when lifting or reaching overhead. Often related to repetitive lifting, sports, or heavy overhead work.
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3. Acromioclavicular (A/C) Joint
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This small joint sits at the top of the shoulder, where the clavicle meets the acromion of the scapula. A/C joint pain often feels like a sharp ache on the very top of the shoulder.
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Pain is aggravated by lifting the arm across the body, reaching overhead, or carrying heavy loads.
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4. Labrum
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The labrum is a ring of cartilage surrounding the shoulder socket, helping to stabilize the joint. Tears can result from trauma, overuse, or repetitive overhead motions.
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Pain may be deep in the shoulder, sometimes accompanied by clicking, popping, or a sense of instability.
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Common Causes of Shoulder Pain
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•Repetitive overhead activities (sports, work, lifting)
•Sudden trauma or falls
•Poor posture or shoulder mechanics
•Age-related tendon degeneration
•Weak or imbalanced shoulder muscles
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Tendonosis is particularly common in people with chronic, gradual pain. Unlike tendonitis, which is inflammatory, tendonosis involves degeneration of tendon tissue, meaning rest alone rarely fixes it.
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Signs It’s More Than “Simple Shoulder Pain”
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•Pain that persists for weeks or months
•Weakness when lifting or rotating the arm
•Clicking, popping, or catching in the joint
•Pain that wakes you at night or limits daily activities
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If any of these sound familiar, it’s worth getting a professional assessment.
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How Our Team Can Help
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At Cardinal Points Clinic, we approach shoulder pain from multiple angles, combining the expertise of our team to support your recovery:
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Osteopathic Manual Therapy
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We assess the shoulder joint, tendons, and surrounding muscles to restore mobility, release tension, and correct movement patterns.
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Registered Massage Therapy
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Targeted massage helps relax tight muscles, improve circulation, reduce discomfort, and support tendon recovery.
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Acupuncture & Traditional Chinese Medicine
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Acupuncture can reduce pain, improve blood flow, and support tissue healing — often complementing hands-on treatment.
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By combining these approaches, we aim to address the root cause of your pain, not just the symptoms. Whether it’s rotator cuff tendonosis, biceps tendonitis, A/C joint irritation, or labral issues, our team is here to help you regain pain-free movement.
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📌 Don’t let shoulder pain limit your life.
Book your assessment and treatment today: Fourcardinalpoints.ca