PATHOLOGY

Detailed explanation-1: -When a harmless substance such as dust, mold, or pollen is encountered by a person who is allergic to that substance, the immune system may over react by producing antibodies that “attack” the allergen. The can cause wheezing, itching, runny nose, watery or itchy eyes, and other symptoms.

Detailed explanation-2: -Allergies occur when your immune system reacts to a foreign substance-such as pollen, bee venom or pet dander-or a food that doesn’t cause a reaction in most people.

Detailed explanation-3: -Pollen allergy is characterized by a TH2-biased immune response to pollen-derived allergens. However, pollen-exposed epithelia do not encounter pure allergen but rather a plethora of protein and non-protein substances.

Detailed explanation-4: -Allergy occurs when a person reacts to substances in the environment that are harmless to most people. These substances are known as allergens. Allergens are found in dust mites, pets, pollen, insects, ticks, moulds, foods and some medications.

Detailed explanation-5: -An allergy is when your immune system reacts to something that is harmless to most people. Substances that cause allergies are called ‘allergens’.