Pollen allergies are common, especially during the blooming season. Allergic reactions occur because the immune system recognizes pollen as a foreign particle that has invaded the body and needs to be destroyed. The secretion of substances that destroy pollen causes allergic symptoms that make many people feel uncomfortable.

Autoimmune pancreatitis and immunoglobulin G4-related disease (IgG4-RD) are new disease entities characterized by enhanced IgG4 antibody responses. Serum IgG4 antibody concentrations are widely used as useful biomarkers for the diagnosis and monitoring of disease activity in autoimmune pancreatitis and IgG4-RD.