Psoriatic arthritis affects up to one in five people with [psoriasis](yourmd:/condition/psoriasis/introduction).
Our Health A-Z contains more information on Psoriatic arthritis.
Rheumatoid arthritis is a long-term condition that causes pain, swelling and stiffness in the joints.
Our Health A-Z contains more information on Rheumatoid arthritis.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.