Not everyone with psoriasis and arthritis has psoriatic arthritis. People with psoriasis can develop other forms of arthritis, just like anyone else. The most common kinds of arthritis are:
Osteoarthritis, the most common kind of arthritis overall. This is the “wear and tear” arthritis caused by aging and injury.
Gout, arthritis characterized by attacks that occur when crystals deposit in the joints. Gout attacks are intensely painful, then subside over days.
Rheumatoid arthritis, an autoimmune disease of the joints. Psoriatic arthritis is also an autoimmune disease, but is different from rheumatoid arthritis.