The role of IL‐33 has been recognized in numerous diseases, such as allergies, chronic inflammation of the gut (Lopetuso, Chowdhry, & Pizarro, 2013), especially allergic asthma (Liew, 2012; Saluja et al., 2015), cardiovascular diseases (Miller & Liew, 2011), disorders of the central nervous system (Gadani, Walsh, Smirnov, Zheng, & Kipnis, 2015), and rheumatoid arthritis (Palmer & Gabay, 2011). This evidence concerns the gene IL33 and rheumatoid arthritis.