What causes GPA?

The exact cause of GPA is unknown. It is thought that GPA is likely to be an autoimmune disease, which means the body's immune system mistakenly attacks its own tissues.

As with other autoimmune disorders, it's probable that people with GPA have a gene that makes them more likely to develop the condition. GPA is then probably triggered by an additional factor, such as an infection with bacteria or a virus.

Genes alone are not responsible for the condition, as it's very unusual for GPA to occur in two people in the same family.

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Medically Reviewed by a doctor on 21 Dec 2018