Tendinitis or tears of the rotator cuff muscle caused by a strain on the shoulder joint produced by the constant motion of a person swimming. Swimmer’s shoulder can be prevented by resting the shoulder regularly between swims and stopping a swim at the first sign of shoulder pain. Proper swimming technique may help prevent swimmer’s shoulder. The swimmer should vary strokes when practicing, keep the body body high in the water and evenly balanced while stroking, engage the hip and abdomen muscles to take some of the load off the shoulders, and keep the head low in the water. Weight lifting with lighter weights and increased repetitions may help condition the shoulders. Physical therapy is generally recommended for treating swimmer’s shoulder. Cortisone injections into the area may be recommended if other measures fail.