what is the definition of allergy
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What is Allergy? Allergy - a definition. Allergy occurs when a person's immune system reacts to substances in the environment that are harmless for most people. These substances are known as allergens and are found in house dust mites, pets, pollen, insects, moulds, foods and some medicines. Atopy is the genetic (inherited) tendency to develop allergic diseases. People with atopy are said to be atopic.
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Allergic reaction Allergic reaction. Allergic reaction: Introduction. An allergic reaction is an over-response of the immune system to a particular substance or allergen (substances that cause an allergic reaction). Allergic reactions are common, and the severity of an allergic reaction can range from mild to severe to life-threatening.
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atopic a·top·ic. adj. Of, relating to, or caused by a hereditary predisposition to developing allergic reactions, such as hay fever, asthma, or urticaria, after exposure to specific antigens such as pollen, food, and insect venoms. [ 1 From Greek atopiā, unusualness, from atopos, out of the way : a-, not; see a-1 + topos, place.]
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Fall 2012 This is the first chance for ALEKS to learn what you know and what you can do. Here are some tips for getting the best results from the initial assessment: 1  Take it seriously. 2  ALEKS studies your answers very carefully and draws a lot of conclusions from each one.ere are some tips for getting the best results from the initial assessment: 1  Take it seriously. 2  Take your time solving problems: at least 2 or 3 minutes, sometimes 5 or 10. 3  ALEKS doesn't have the imagination needed to guess what you meant to say, if what you actually said isn't quite right. 4  Don't tire yourself out. 5  Don't cheat yourself by cheating.
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Food Allergy A food allergy is a reaction by the body's immune system to something in a food, usually a protein; the body mistakenly acts like it is a germ or some other invader, and does its best to defend itself.
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Allergy-Immunology Glossary Allergy-Immunology Glossary. Here are definitions of some of the words frequently encountered in literature on allergy and asthma. Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms.
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Allergies Types of Allergies. An allergy occurs when your body’s immune system sees a certain substance as harmful. It reacts by causing an allergic reaction. Substances that cause allergic reactions are allergens. There are many types of allergies. Some allergies are seasonal and others are year-round. Some allergies may be life-long. It is important to work with your health care provider to create a plan to manage your allergy. Avoiding your allergens is the best way to prevent an allergic reaction.
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Allergen An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body.Such reactions are called allergies.hen an allergen enters the body of an individual that is predisposed to allergies, it triggers an immune reaction and the production of antibodies. These allergen antibodies migrate to mast cells lining the nose, eyes and lungs.
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Medical Glossary ALLERGY: an abnormal immune response to an antigen (allergen) that does not normally cause an adverse reaction (e.g., animal dander, pollen). Allergic reactions are caused by the release of histamine by mast cells, a type of white blood cell.
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- An allergy is the result of an overreaction of the immune system in the presence of an allergen, no matter whether that allergen is real or perceived An allergy is the result of an overreaction of the immune system in the presence of an allergen, no matter whether that allergen is real or perceived
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allergen allergen. 1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity. 2. an extract of any substance known to cause allergy. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test).
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Allergy and the immune system Allergy: An allergy is an exaggerated immune reaction to substances that are normally harmless. Allergy can appear in many forms and cause many symptoms, such as sneezing, respiratory symptoms such as asthma or hay fever, itching, skin rashes, or generalised reaction such as anaphylaxis.
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Allergies Anaphylaxis (anna-fih-LACK-sis) is a severe allergic reaction that can be life-threatening and requires immediate medical attention. It happens fast and may cause death. Symptoms usually involve more than one part of the body, such as the skin or mouth, the lungs, the heart and the gut. Learn more about anaphylaxis.
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Difference Between Allergen and Antigen • Definition: • An allergen is a nonparasitic foreign substance that can cause certain immune reactions in the body when it enters the body. • Antigen is a foreign substance that can trigger immune system to produce a specific immune response by the production of antibodies.
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allergen allergen. 1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity. 2. an extract of any substance known to cause allergy. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test).They are also used to densensitize or hyposensitize allergic individuals. See immunotherapy. Almost any substance in the environment can be an allergen.. an extract of any substance known to cause allergy. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test). They are also used to densensitize or hyposensitize allergic individuals. See immunotherapy. Almost any substance in the environment can be an allergen.
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Allergy Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little or no problem in most people. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, runny nose, shortness of breath, or swelling. Food intolerances and food poisoning are separate conditions.
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Translations for food allergy Freebase (0.00 / 0 votes) Rate this definition: Food allergy. A food allergy is an adverse immune response to a food protein. They are distinct from other adverse responses to food, such as food intolerance, pharmacological reactions, and toxin-mediated reactions. The protein in the food is the most common allergic component.
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allergen allergen. 1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity. 2. a purified protein of a food (such as milk, eggs, or wheat), bacterium, or pollen. adj., adj allergen´ic. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test).. an extract of any substance known to cause allergy. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test). They are also used to densensitize or hyposensitize allergic individuals. See immunotherapy. Almost any substance in the environment can be an allergen.
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allergen 1. 1  any substance, often a protein, that induces an allergy: common allergens include pollen, grasses, dust, and some medications. 2  any substance capable of inducing an allergy.
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Definitions &Translations Princeton's WordNet(0.00 / 0 votes)Rate this definition: immediate allergy, atopy, atopic allergy, type I allergic reaction(noun) an allergic reaction that becomes apparent in a sensitized person only minutes after contact.
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- Full Definition of ALLERGEN. : a substance (as pollen) that induces allergy. — al·ler·gen·ic \ˌa-lər-ˈje-nik\ adjective. — al·ler·ge·nic·i·ty \ˌa-lər-jə-ˈni-sə-tē\ noun. See allergen defined for English-language learners.
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Allergy to Paint Allergies Explained. Allergens are foreign substances that provoke an immune response known as allergies in some, but not all people. Airborne pollen, dust, mold and animal dander are typical allergens. People also develop allergies to certain foods, drugs and chemicals.
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allergen Noun. 1. allergen-any substance that can cause an allergy. substance-a particular kind or species of matter with uniform properties; shigella is one of the most toxic substances known to man. ragweed pollen-pollen of the ragweed plant is a common allergen.Translations.. A substance, such as pollen, that causes an allergy. [German. : , allergy; see allergy +. , -gen (from French. ; see-gen).]. al′ler·gen′ic (-jĕn′ĭk) adj.
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atopy [at´o-pe] a clinical hypersensitivity state or allergy with a hereditary predisposition; the tendency to develop an allergy is inherited, although the specific clinical form (such as hay fever or asthma) is not. The antibody reagin is involved. Called also atopic, hereditary, or spontaneous allergy.
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anergy Definition of anergy. : a condition in which the body fails to react to an antigen.