What is psoriatic arthritis?
Psoriatic arthritis (PsA) is an inflammatory arthritis that affects around 1 in 5 people with psoriasis. It causes joint pain, swelling and stiffness — often in fingers, toes, lower back or knees — plus nail changes and skin plaques. Early diagnosis and DMARDs or biologics prevent joint damage.
Last updated 2026-07-01. This is general information, not a substitute for personalised medical advice.
Frequently asked questions
Can you have PsA without psoriasis?
Yes, about 15% of people develop joint symptoms before skin symptoms. Family history and nail pitting are clues.
Is psoriatic arthritis worse than rheumatoid arthritis?
Both can cause serious joint damage. PsA has more variable patterns; RA is usually more symmetrical. Outcomes depend on early treatment.