Psoriatic arthritis (PsA) is a systemic type of arthritis that presents much like rheumatoid arthritis. It’s a “hot,” burning arthritis that causes joints to become inflamed, stiff, and painful. Like rheumatoid arthritis, PsA is an autoimmune condition characterized by immune system hyperactivity.
In other words, your immune system pounces on your own body, especially your tendons and ligaments.