There are many causes and factors that cause shoulder pain and shoulder impingement is a common reason that causes shoulder pain. The other name for shoulder impingement is, swimmer’s shoulder because it’s common in swimmers. It also commonly occurs in athletes who are playing games that have more shoulder movement like baseball.
A group of muscles consists of the rotator cuff and the shoulder is bound by tendons to the upper arm. The rotator cuff facilitates the arm and arm elevation to rotate.
The rotator cuff rests under the top of the shoulder and is called the acromion. The rotator cuff grips or rubs against the acromion if you have shoulder impingement. When you lift your arm, the space (bursa) between the rotator cuff and acromion narrows, which increases pressure. The increased pressure irritates the rotator cuff, leading to impingement.