Age-related changes are another cause of biceps tendonitis. The ligament that courses over the long head of the biceps tendon can thicken as you age due to repeated micro-trauma to the area.

The long head of the biceps, which is a stabilizer of the shoulder joint, is found within these muscles. The most common type of biceps injury happens at the long head of the biceps tendon.

The long head of the biceps and its glenoid labral attachment, the biceps labral complex, constitute an integral part of the anatomy optimizing ball-and-socket kinematics and dynamic glenohumeral ...