Discover the signs of psoriatic arthritis, from joint pain and skin changes to nail damage and fatigue, plus the latest treatment options for this condition.

Rheumatoid arthritis, or RA, is an autoimmune and inflammatory disease that primarily affects joints. The disorder is ...

Having psoriasis raises your risk of psoriatic arthritis — and rheumatoid arthritis, too. Make sure you can tell these two forms of arthritis apart.