Doctor's Notes on Tendinitis (Tendonitis)
Tendinitis (also spelled tendonitis) is inflammation of the tendons, which are cords of tough, fibrous connective tissue that attach muscles to bones. The tendon sheath (the membrane that surrounds the tendon) may also be affected. A common cause of tendinitis is overuse and repetitive movement from sports or recreational and occupational activities. Other risk factors for developing tendinitis include trauma, thermal injury to the tendon, use of fluoroquinolone antibiotics [such as levofloxacin (Levaquin) or ciprofloxacin (Cipro)], and smoking. Tendinitis is also seen in patients who have rheumatoid arthritis, obesity, and diabetes.
Symptoms of tendinitis include pain over the affected tendon that usually worsens with repetitive motion, but it can also be present at rest. There may also be mild swelling over the tendon.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.