This condition is caused by spurs of bone forming on the acromion which causes abrasion of the tendon and the bursa producing pain when raising the arm. Pain is often felt over the cape of the shoulder and upper arm and is particularly noticeable at night. Pain killers and anti-inflammatory medication can reduce pain in conjunction with physiotherapy to strengthen muscles. Steriod injections can also help to reduce inflammation. Athroscopic subacromial decompression is a keyhole surgical technique which can be performed to remove bone spurs to treat this condition.