The median concentrations of IL-4 and IL-5 were 54.8 (10.2–84.1) and 28.2 (13.8–30.0) pg/mL vs. 156.4 (110.5–231.2) and 30.1 (28.2–136.4) pg/mL in the control and CRSwNP groups, respectively (p < 0.001 and p = 0.014, Figure 2). Here, IL5 is linked to chronic rhinosinusitis with nasal polyps.