Histamine is a chemical compound that plays an important role in various physiological processes, including immune responses and regulation of blood vessels. It is produced by cells in response to injury or inflammation and is released into the surrounding tissue. Histamine is also present in certain foods such as fermented products like sauerkraut, yogurt, and cheese.
When histamine levels rise due to an allergic reaction or exposure to certain substances, it can cause a range of symptoms including redness, swelling, itching, and hives. These reactions are known as histamine reactions or allergies. Antihistamines medications work by blocking the action of histamine in the body, reducing these symptoms.
In summary, histamine is a chemical compound that plays an important role in immune responses and blood vessel regulation, but can also cause allergic reactions when levels rise due to exposure to certain substances or conditions.