Autoimmune or inflammatory diseases are often associated with each other. Although a definite link between psoriatic arthritis and inflammatory bowel disease (IBD) hasn't yet been made, it is easy to see how the overactive or inappropriate immune response and inflammation might affect various systems of the body, not just one. Arthritis and other similar joint problems are common among people with IBD, as are a variety of different skin conditions, including psoriasis.

 

Although psoriatic arthritis and IBD are often treated with the same or similar medications, sometimes the medications themselves could be causing the problem. For instance, there have been reports of psoriasis due to some of the medications used to treat IBD.