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Pain from trigger points in the supraspinatus muscle.
The supraspinatus muscle makes up part of the rotator cuff. It is responsible for assisting in shoulder abduction as well lateral rotation and stabilizing the shoulder joint. This muscle is often overloaded in labourers and tradesman who have to do a lot of overhead work. Athletes who do a lot of throwing movements will also frequently have Tigger point in this muscle. These trigger points will cause pain to be felt into the shoulder and down the arm, as well as stiffness and weakness.
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Trigger points in the Teres minor muscle
The Teres minor muscle is on of the rotator cuff muscles. It originates on the lateral border of the scapula, and inserts on the inferior facet of the greater tubercle of the humerus. This muscle assists with external rotation of the humerus as well as shoulder stability. This muscle is often damaged with a shoulder injury. Trigger points will refer into the posterior deltoid and down the back of the arm.
Pain from subclavius trigger points
The Subclavius muscle is a small muscle on the underside of the clavicle. It originates on the first rib and it’s cartilage, and inserts on the inferior clavicle. It’s main function is to assist in protraction of the shoulder. This muscle is often shortened and tight from poor rounded shoulder posture. When trigger points form in this muscle they can refer pain into the anterior shoulder and down the radial part of the arm. Pain can also be referred into the thumb and first two fingers. 
Aberdeen Chiropractic 