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What causes psoriatic arthritis?

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We don't know exactly why some people get the condition and others don't, but it seems to run in families. As many as 40% of people with psoriatic arthritis have a family member with skin or joint problems.

SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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What does psoriatic arthritis affect?

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