Rotator cuff tendinitis is also called impingement, bursitis or biceps tendinitis. These are all different names for the same problem. They mean that there is pain and swelling of the cuff tendons and the surrounding bursa. The bursa is a soft sack that contains a small amount of fluid and cushions the joint.

What causes rotator cuff tendinitis?

Rotator cuff tendinitis does not occur all at once. Usually, it happens over a long period with repeated irritation to an area. It happens more often in people with loose joints, people with abnormal bony anatomy in the shoulder and people who do heavy or repetitive lifting above shoulder level.

Lifting overhead or just moving the arm above the head may cause pinching of one of the tendons of the rotator cuff between the upper part of the arm bone and the acromion (which is part of the shoulder blade). This pinching is called impingement. Other causes include calcium in the tendons or a sudden injury to the shoulder.

What are the stages of rotator cuff injury?

The first warning sign of cuff injury is pain and swelling of the bursa, as described above. Shoulder weakness and/or limited range of motion can also occur with long-term irritation or outright injury to the shoulder. The tendinitis can progress to a partial or complete tear of a tendon due to progressive weakening of the fibers.

https://www.hopkinsmedicine.org/health/conditions-and-diseases/rotator-cuff-tendinitis#:~:text=What%20is%20rotator%20cuff%20tendinitis,tendons%20and%20the%20surrounding%20bursa.
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