A rotator cuff tear can happen gradually over time or suddenly from a traumatic injury, leading to pain, reduced shoulder mobility, and perceived muscle weakness. The tear usually occurs where the tendon inserts onto the head of the humerus, meaning it no longer fully attaches to the bone. Rotator cuff tears are commonly seen in athletes like swimmers, tennis players, and baseball pitchers, but they also occur as a natural part of aging due to tendon wear over time. Tears are classified based on