Shoulder pain is common in men and women who remain physically active in their thirties and forties. There are many potential causes, but one of the more common is something called impingement syndrome.
Impingement syndrome is a condition that causes pain in the front of the shoulder, particularly with overhead activities, resulting from bursitis and tendinitis in the rotator cuff tendon. Middle-aged men and women who lift weights regularly are particularly prone to this condition because of muscle imbalances that can develop around the shoulder with improper training. This can result in anterior shoulder pain when lifting the arm above the shoulder or across the chest, often with aching at night that makes it difficult to sleep.