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Arthritis and Your Joints
Osteoarthritis (OA)
Animation: Understanding OA
Arthritis Symptom Checklist
Rheumatoid Arthritis (RA)
Animation: Understanding RA
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Arthritis and Your Joints

Arthritis is a medical term that literally means joint inflammation. It can refer to any 1 of more than 100 or so diseases that make your joints feel painful, stiff, and swollen. The most common forms are osteoarthritis (OA) and rheumatoid arthritis (RA). Of these, OA is by far the more common, affecting approximately 21 million Americans, whereas an estimated 2.1 million people—about 1% of all American adults—have RA. If you have joint pain, stiffness, and/or swelling for more than 2 weeks, you may have arthritis. Make an appointment to speak with your doctor.

Arthritis or chronic joint symptoms affect approximately 70 million adults, or roughly 1 in 3 Americans.

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Last updated: May 23, 2005.