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Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity.
Drug intolerance or drug sensitivity refers to an inability to tolerate the adverse effects of a medication, generally at therapeutic or subtherapeutic doses. Conversely, a patient is said to be "tolerating" a drug when they can tolerate its adverse effects.
Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.
Allergen immunotherapy, also known as desensitization or hypo-sensitization, is a medical treatment for environmental allergies, such as insect bites, and asthma. [1] [2] Immunotherapy involves exposing people to larger and larger amounts of allergens in an attempt to change the immune system's response.
Is it a food allergy, sensitivity or intolerance? Here's how to tell, according to experts.
Type I hypersensitivity (or immediate hypersensitivity), in the Gell and Coombs classification of allergic reactions, is an allergic reaction provoked by re-exposure to a specific type of antigen referred to as an allergen.
We talked to the division chief of UNC Pediatric Allergy & Immunology to get answers about treatments for seasonal allergies. OTC meds vs. allergy shots: A UNC doctor weighs in on NC’s early ...
For example, a person who developed an allergy to a red dye will be allergic to any new drug which contains that red dye. A drug allergy is different from an intolerance. A drug intolerance, which is often a milder, non-immune-mediated reaction, does not depend on prior exposure.
Allergy symptoms happen when the immune system interprets typically harmless substances, such as grass or pollen, as threats. People without allergies don’t have immune responses to these ...
Unlike the more common Type I allergies (e.g. hay fever), contact allergies are not mediated by histamine, making the use of normal allergy medication (antihistamine) medication ineffective and other drugs have to be used to treat the allergic reaction.