Which factor can contribute to shoulder impingement syndrome?

Shoulder impingement syndrome occurs when the shoulder's rotator cuff tendons become irritated and inflamed as they pass through the subacromial space, often due to mechanical factors that lead to decreased space in this area. Overhead lifting is a primary contributor to this condition because it places excessive load on the shoulder joint and can lead to repetitive microtrauma to the rotator cuff tendons. When lifting overhead, the arm is positioned in a way that may cause the tendons to be squeezed against the acromion, a bony projection on the shoulder blade. This repeated compression can lead to inflammation and pain characteristic of shoulder impingement syndrome.

In contrast, while excessive gaming, carrying heavy bags, and prolonged sitting can cause discomfort or issues with posture and muscle strain, they do not specifically create the same type of mechanical stress on the shoulder joint that leads to impingement. Overhead activities are the key factor that directly affects the space available for the rotator cuff tendons, making it the most relevant contributor to this condition.