PATHOLOGY

Detailed explanation-1: -A hypersensitivity reaction is an overreaction of your immune system to something that would not usually cause an immune response. This leads to allergy symptoms. There are different types of hypersensitivity reactions.

Detailed explanation-2: -An allergy occurs when the body overreacts to an allergen or ‘trigger’ that is typically harmless to most people. Examples of allergies include: hay fever (allergic rhinitis) asthma.

Detailed explanation-3: -An overactive immune system 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-4: -Allergy is an immune‐related disease and results from a hypersensitive immune response to harmless substances in the environment.

Detailed explanation-5: -Allergy is described as an exaggerated response from the body’s immune system to otherwise inert substances present in the environment.