Tendinitis is perhaps the most common shoulder problem. The common names of shoulder tendinitis — pitcher's shoulder, swimmer's shoulder, tennis shoulder — are an indication of the sports involved.

Tendinitis is inflammation of a tendon. When it happens in the shoulder, the rotator cuff or the biceps tendon are inflamed, usually as the result of being pinched. This squeezing or pinching of the rotator cuff is called shoulder "impingement."

• Learn more about tendinitis, bursitis and impingement

If you have pain and stiffness, call your doctor.