injuries and poisoning
Rotator Cuff Injury Subacromial Bursitis
Symptoms of Rotator Cuff Injury
Shoulder pain is the main symptom. At first, the pain occurs only during activities that require lifting the arm over the head (impingement syndrome). Pain is worse when lifting the arm between 60 and 120° away from the side. Unless effectively treated, the shoulder may later become painful at rest (tendinitis), often particularly at night, disrupting sleep. If the tendon tears, normal outward turning of the arm at the shoulder is weak or impossible. 