Psoriatic Arthritis Overview

Psoriatic arthritis (PsA) is an autoimmune disease that affects your joints, causing pain, stiffness, and swelling as well as long-term damage. People commonly associate psoriatic arthritis with psoriasis, an autoimmune disease that affects the skin, causing flares of red, silvery plaques, although you don’t necessarily need to have psoriasis to develop PsA. Learn more about the causes, symptoms, and diagnosis of PsA.