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Last updated Monday, December 27, 2004
Incidence
Approximately 10% of people who have the skin condition known as psoriasis will develop an associated inflammatory arthritis. Inflammatory forms of arthritis are those that cause prolonged stiffness in the night and morning along with joint swelling and pain and are generally better with activity.
Psoriatic arthritis affects about 300,000 people in the United States. It affects men and women of all races. It usually occurs between the ages of 20 and 30, but it can occur at any age. It affects about five to eight percent of people who have psoriasis.
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