The Subclavius

About the Subclavius

The subclavius is a small muscle located directly underneath the collarbone. Because it is hidden beneath the pectoralis major, people may overlook it as a possible source of discomfort around the collarbone, chest, shoulder, or arm.

Trigger points may develop when this muscle is repeatedly overloaded or held under tension. Although the tender area is located below the collarbone, discomfort may be felt farther along the arm.

Subclavius Referred Pain and Related Symptoms

Trigger points in the subclavius may produce discomfort below the collarbone and in the front of the shoulder. In some people, referred discomfort may travel through the upper arm and along the thumb side of the forearm toward the hand.

• Tenderness or aching directly below the collarbone.
• Discomfort in the front of the shoulder or upper chest.
• Pain that may travel into the upper arm or forearm.
• Discomfort that may extend toward the thumb side of the hand.
• Symptoms during repetitive shoulder or arm activity.

These symptoms may overlap with those associated with the pectoral muscles, rotator cuff, neck, or nerves and blood vessels passing beneath the collarbone. A referred-pain pattern can provide a useful clue, but it cannot confirm the cause of pain.

The image above shows possible locations of subclavius trigger points and referred discomfort.

What May Contribute to Subclavius Trigger Points?

• Repeated lifting, reaching, pushing, or pulling.
• Carrying a heavy bag or backpack with shoulder straps.
• Holding the shoulders forward or downward for extended periods.
• Strength training that repeatedly loads the chest and shoulder.
• A sudden increase in upper-body exercise or activity.
• Insufficient recovery between demanding activities.

How to Help Prevent Subclavius Trigger Points from Returning

• Increase exercise and lifting intensity gradually.
• Take regular breaks from repetitive shoulder and arm movements.
• Avoid carrying heavy bags on the same shoulder for long periods.
• Adjust straps that pull the shoulder downward or press against the collarbone.
• Use comfortable shoulder positioning while working or exercising.
• Allow enough recovery time between demanding activities.

Pay attention to activities or positions that repeatedly bring back your symptoms. Reducing or modifying the aggravating movement may be as important as massaging the tender area.