Symptoms of shoulder impingement include pain which comes on gradually over a period of time. There will be pain at the front and side of the shoulder joint, especially during overhead movements such as in throwing, racket sports and swimming.
There may be pain at the back and front of the shoulder when the arm is held out to the side or abducted and turned outwards into external rotation. Another give away sign of impingement is pain when lifting the arm above 90 degrees, particularly against resistance. See shoulder impingement tests