👉 Histamine is a chemical compound that plays a crucial role in the body's response to allergens, such as pollen and dust. It is produced by mast cells, which are found throughout the body and can be activated by various substances. In humans, histamine production increases during allergy symptoms, including sneezing, runny nose, itchy eyes, and nasal congestion. This increase in histamine levels is known to trigger the release of other chemicals from mast cells, such as histamine H
