Allergies
What are allergies?
Allergies are a short-term inflammation of the mucous membranes that line the nasal passages. There are two general kinds of allergies: seasonal allergies and perennial allergies. A seasonal allergy is an allergic reaction to a trigger that is typically only present for part of a year, such as spring or fall. Seasonal allergies are caused by a reaction to pollen, such as trees, weeds and grasses. Perennial allergies are usually present year-round, and include allergens such as pet dander and house dust mites. Molds can be a seasonal or perennial allergy trigger.
In allergies, airborne triggers from various seasonal plants or other allergens like pet dander and mold enter the body through the eyes, nose, or throat, and trigger an allergic reaction. For many, the immune system does not respond to mild substances like pollen and mold. But in sensitive people, the body's defense mechanism views these allergens as it would an infectious agent and mounts an attack, unleashing a cascade of chemicals such as histamine and other compounds resulting in localized inflammation that leads to irritation and discomfort. The symptoms of an allergic reaction can begin five to 10 minutes after exposure to a trigger. The standard reactions include sneezing, itchy throat, headache, swollen sinuses, runny nose, and itchy, watery eyes.
