Shock therapy improves pain and function in patients with chronic calcific shoulder tendinitis, according to an article published in Annals of Internal Medicine. Rotator cuff tendonitis is one of the most common causes of shoulder pain and may present with or without calcifications. There is little evidence to suggest that conventional therapies, such as rest, ice, nonsteroidal anti-inflammatory drugs, physical therapy, and subacromial corticosteroid injections can effectively ease pain or restore function. Calcific tendinitis, in particular, may be more difficult to manage and may require surgery. Extracorporeal shockwave therapy (ESWT), which uses sound waves of high or low energy that impart rapid fluctuations of pressure to tissues, has been suggested as an alternative treatment to expensive and risky surgical interventions.