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How Common is Psoriatic Arthritis in People with Psoriasis?

The prevalence of psoriatic arthritis (PsA) among psoriasis patients is higher than previously thought, according to several international studies published between 2013 and 2015. In North America and Europe, between 18 and 42 percent of people with psoriasis, an inflammatory skin disease, also have psoriatic arthritis. In the United States, psoriasis affects about 2.2 percent of the population (7.5 million people), making it the most prevalent autoimmune disease in the US. In addition to skin problems associated with psoriasis, psoriatic arthritis affects the joints and other parts of the body.

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