The deltoid is the muscle that covers the tip of the shoulder. It contributes to pain in the shoulder and upper arm. One indication of problems with the deltoid muscle is pain is most intense during activity and subsides when resting the shoulder and arm.

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The teres major is a shoulder muscle. It can contribute to pain in the shoulder, upper arm, and forearm. An indication of teres major muscle involvement is pain is felt in the shoulder and upper arm skipping the elbow and reoccurring in the back of the forearm.

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Rhomboid Major and Rhomboid Minor Muscles: Trigger Point Pain The rhomboids are two separate muscles, the rhomboid major and the rhomboid minor. The muscles are located in the upper back and connect the shoulder blades to the neck and upper back vertebrae. Rhomboid trigger points (TrPs) pain is felt around the inner edge of the…

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