1. Viral arthritis  (Trust Mark: Doctor-Reviewed)
Viral arthritis is swelling and irritation (inflammation) of the joints from a viral infection. • Reviewer: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Jatin M. Vyas, Phd, MD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

2. Arthritis  (Trust Mark: Doctor-Reviewed)
Arthritis is inflammation of one or more joints, which results in pain, swelling, stiffness, and limited movement. There are over 100 different types of arthritis. See also: Joint pain• Reviewer: Ariel D. Teitel, MD, MBA, Chief, Division of Rheumatology, St. Vincent's Hospital, New York, NY. Review provided by Verimed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.