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What causes psoriatic arthritis (PsA)?

Psoriatic arthritis is linked to psoriasis, a condition in which cells of dead skin accumulate too quickly, forming scaly red patches. Both conditions are caused by an autoimmune response, meaning the body's immune system attacks its own healthy tissue and cells. Genetics and the environment may play a role.

No one knows for sure what causes psoriatic arthritis (PsA). It is known that sometimes it runs in families. Some people believe that an infection causes the immune system to attack the joints.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.