Psoriasis has been associated with other autoimmune diseases, e.g. inflammatory bowel disease and autoimmune thyroid disease. These diseases may share genetic susceptibility loci and autoimmune mechanisms including interleukin-17-dependent pathways. However, the relationship between psoriasis and autoimmune thyroid disease remains unclear and a recent meta-analysis of available evidence concluded that more data are needed. This article is protected by copyright. All rights reserved.