Psoriatic Arthritis Though psoriatic arthritis has many similar symptoms as RA, including pain, swelling and stiffness of the joints, there are several differences. First of all, 85 percent of people who develop PA have psoriasis first. Psoriasis is not a comorbid condition of RA. PA also has more asymmetric joint invovlement and no nodules, among other things. Inflammatory Erosive Osteoarthritis IEO can look similar to rheumatoid arthritis, in that the inflammatory process is taking... Read More