How does psoriatic arthritis occur?
Like psoriasis, psoriatic arthritis is an autoimmune disease, meaning that it is caused by the immune system acting against healthy cells. In psoriasis, the immune system attacks the skin cells, whereas in psoriatic arthritis the tendons and linings around the joints are affected. The resulting inflammation causes these linings to thicken; over time, this affects joint function and structure.
Author: Lauren Donley
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.4/5 Votes: 969