ANATOMY

Detailed explanation-1: -If you are born with certain genes, your immune system may react to substances in the environment that are normally harmless. These substances are called allergens. Having an allergic reaction is the most common example of an overactive immune system.

Detailed explanation-2: -An allergy is when your immune system reacts to something that is harmless to most people. Substances that cause allergies are called ‘allergens’. Common allergies include: food allergies (including fish and shellfish, nuts, eggs, wheat, dairy, soy)

Detailed explanation-3: -Hypersensitivity reactions are exaggerated or inappropriate immunologic responses occurring in response to an antigen or allergen. Type I, II and III hypersensitivity reactions are known as immediate hypersensitivity reactions because they occur within 24 hours of exposure to the antigen or allergen.

Detailed explanation-4: -The immune system then produces antibodies that remain on the alert for that particular allergen. When you’re exposed to the allergen again, these antibodies can release a number of immune system chemicals, such as histamine, that cause allergy symptoms.

Detailed explanation-5: -Hypersensitivity syndrome is caused by a complex set of interactions between a medication, your own immune system, and viruses in your body, especially herpes viruses.