How Common is Psoriatic Arthritis?
Psoriatic arthritis (PsA) is a chronic inflammatory arthritis linked to psoriasis. It is difficult to diagnose PsA, which has led to a high number of people who are misdiagnosed or undiagnosed. There are a couple of reasons why:1
PsA involves a wide range of symptoms that vary from person to person. There is a lack of widely accepted diagnostic criteria for PsA.
Who gets PsA and psoriasis?
Experts think that roughly 1 million people in the United States have PsA. Men and women are equally affected. The condition generally develops in people who are 30 to 50 years old. It is most common in people who are in their 40s and 50s.2,3
Studies show that about 1 in 3 people with psoriasis will go on to develop PsA. Among those who have PsA, 85 percent of them had psoriasis first. More than 15 percent of people with psoriasis may be living with PsA and not know it because symptoms vary greatly.3
Special populations affected by PsA
While PsA affects men and women equally, there are special populations with unique considerations.4-6

This or That
I'm usually in more pain during the...