What is a shoulder impingement and how can it occur?

Shoulder impingement is a chronic compression injury to the soft-tissue structures of the shoulder joint. When you move your arm overhead, the space between your humerus (arm bone) and the acromion (pointy end) of your shoulder blade shrinks, and the tendons running through that area from your rotator cuff can get irritated. Normally, this temporary compression does not lead to any injury, but consistently repeating overhead motions can lead to irritation and pain. If left untreated, the constant compression of the structures in the shoulder joint can lead to more debilitating effects and chronic shoulder pain.

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