DefinitionTendinitis is inflammation, irritation, and swelling of a tendon, which is the fibrous structure that joins muscle to bone. In many cases, tendinosis (tendon degeneration) is also present.Alternative NamesCalcific tendinitis; Bicipital tendinitisCauses, incidence, and risk factorsTendinitis can occur as a result of injury, overuse, or with aging as the tendon loses elasticity. It can also be seen in persons with body-wide (systemic) diseases such as rheumatoid arthritis or diabetes.Tendinitis can occur in any tendon, but some commonly affected sites include the:ElbowHeel (Achilles tendinitis)ShoulderWristSymptomsPain and tenderness along a tendon, usually near a jointPain at nightPain that is worse with movement or activitySigns and testsThe health care provider will perform a physical exam and look for signs of pain and tenderness when the muscle attached to the tendon is used against resistance. There are specific tests for specific tendons.The tendon can be inflamed, and the overlying skin may be warm and red.TreatmentThe goal of treatment is to relieve pain and reduce inflammation.Rest or immobilization of the affected tendons is helpful for recovery. This may be achieved using a splint or a removable brace. The application of heat or cold to the affected area can help.Nonsteroidal anti-inflammatory medications (NSAIDs), such as aspirin or ibuprofen, can also reduce both pain and inflammation. Steroid injections into the tendon sheath can also be very useful in controlling pain and allowing physical therapy to start.Physical therapy that stretches and strengthens the muscle and tendon is essential. This can restore the tendons ability to function properly, improve healing, and prevent future injury.advertisementRarely, surgery is needed to physically remove the inflammatory tissue from around the tendon.Expectations (prognosis)Symptoms improve with treatment and rest. If the injury is caused by overuse, a change in work habits may be indicated to prevent recurrence of the problem.ComplicationsLong-term inflammation raises the risk of further injury, such as ruptureTendinitis symptoms returnCalling your health care providerCall for an appointment with your health care provider if symptoms of tendinitis occur.PreventionAvoid repetitive motion and overuse of the arms and legs.Keep all your muscles strong and flexible.Warm up by exercising at a relaxed pace before engaging in vigorous activity.ReferencesChoi L. Overuse injuries. In: DeLee JC, Drez D Jr, Miller MD, eds. DeLee and Drez’s Orthopaedic Sports Medicine. 3rd ed. Philadelphia, Pa: Saunders Elsevier; 2009:chap 14.Drezner JA, Harmon KG, O’Kane JW. Sports medicine. In: Rakel RE, ed. Textbook of Family Medicine. 8th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 29.Review Date:8/14/2012Reviewed By:Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.