Inflammation of tendons/bursa restricts the space under the bony prominence of the shoulder (the acromion) causing pain, especially when lifting the arm above shoulder height. Common in tennis, throwing sports, weightlifting and building trades.
A tear of the supraspinatus, infraspinatus, teres minor or subscapularis. A common shoulder injury often caused by trauma, overuse or degeneration. Symptoms can include pain on shoulder movements, pain when lying on the affected side and difficulty with daily activities e.g. lifting, dressing/undressing.
Connective tissue surrounding the shoulder joint becomes inflamed and stiff and adhesions form restricting movement and causing pain. Cause is unclear.