allergic reaction defined
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Allergic Reaction An allergic reaction occurs when the immune system overreacts to a harmless substance known as an allergen. The immune system protects the body from infections, viruses and diseases.
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antibody-mediated hypersensitivity 1. a state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign agent; allergy is a synonym for hypersensitivity. anaphylaxis is a form of hypersensitivity.
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Learn About Allergies The topic of allergies has become routine in our lives, and certainly most everyone has an idea of what an allergy is. An allergy is an abnormal reaction by a person's immune system against a normally harmless substance. A person without allergies would have no reaction to this substance, but when a person who is allergic encounters the trigger, the body reacts by releasing chemicals which cause allergy symptoms.
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What is anaphylaxis? Anaphylaxis is the name given to an extreme form of allergic reaction. Typically, it occurs very suddenly and without warning. The symptoms get rapidly worse and, without treatment, can cause death. The symptoms affect many parts of the body.
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Allergen Not to be confused with Allergan. 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.
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What is Allergy? When a person who is allergic to a particular allergen comes into contact with it, an allergic reaction occurs. This begins when the allergen (for example, pollen) enters the body, triggering an antibody response. The antibodies attach themselves to special cells, called mast cells.
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anaphylactic shock anaphylactic reaction anaphylaxis. anaphylactic shock a serious and profound state of shock brought about by hypersensitivity (anaphylaxis) to an allergen such as a drug, foreign protein, or toxin. Sometimes it occurs upon second injection of a patient with a previously injected serum or protein.
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Overview Anaphylaxis is a severe, potentially life-threatening allergic reaction. It can occur within seconds or minutes of exposure to something you're allergic to, such as a peanut or the venom from a bee sting.
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Immunologic Tolerance Anergy is a term in immunobiology that describes a lack of reaction by the body's defense mechanisms to foreign substances, and consists of a direct induction of peripheral lymphocyte tolerance.
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Anaphylaxis Anaphylaxis Overview. Anaphylaxis (an-a-fi-LAK-sis) is a serious, life-threatening allergic reaction. The most common anaphylactic reactions are to foods, insect stings, medications. If you are allergic to a substance, your immune system overreacts to this allergen by releasing chemicals that cause allergy symptoms. Typically, these bothersome symptoms occur in one location of the body.
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Hypersensitivity Hypersensitivity (also called hypersensitivity reaction or intolerance) is a set of undesirable reactions produced by the normal immune system, including allergies and autoimmunity.
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2018 ICD-10-CM Diagnosis Code T78.40 An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Normally, your immune system fights germs. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm.
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Glossary Allergy: A condition in which the body has an exaggerated response to a substance (e.g. food or drug). Also known as hypersensitivity. Anaphylaxis: Listen [MP3] An immediate and severe allergic reaction to a substance (e.g. food or drugs).
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- An acute hypersensitivity reaction is a rare but serious complication of exposure to foods, natural-rubber latex, medications, and other antigens. Patient allergies are not always clearly defined in the medical record, and severe reactions may not be anticipated.
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Translations for allergy and immunology U.S. National Library of Medicine(3.00 / 1 vote)Rate this definition: Allergy and Immunology. A medical specialty concerned with the hypersensitivity of the individual to foreign substances and protection from the resultant infection or disorder.
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Adverse reactions to drugs Reactions that occur only in susceptible subjects. 1  Drug intolerance—A low threshold to the normal pharmacological action of a drug. 2  Drug idiosyncrasy—A genetically determined, qualitatively abnormal reaction to a drug related to a metabolic or enzyme deficiency.
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- An anaphylactic reaction is an acute systemic hypersensitivity reac-. tion that occurs within seconds or minutes after exposure to certain. foreign substances, such as medications (penicillin, iodinated con-. trast material), and other agents, such as latex, insect stings (bee,
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Drug allergies URL of this page: //medlineplus.gov/ency/article/000819.htm. Drug allergies are a group of symptoms caused by an allergic reaction to a drug (medicine). A drug allergy involves an immune response in the body that produces an allergic reaction to a medicine. The first time you take the medicine, you may have no problems.
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Patch testing for skin allergies An allergic reaction is specific to the individual and to a substance (or a group of related substances) called an allergen. Allergy is a hypersensitivity (oversensitivity) to a particular substance, and always involves the immune system. All areas of skin that are in contact with the allergen develop the rash.
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Allergy, Types of Allergic Reactions and Anaphylaxis Type II Allergic Reaction. Type II allergic reactions can result from the chemical alteration of antigens present on the surface of some of the cells (like red blood cells) by certain drugs. The alteration in the antigen on the cell surface can result in formation of antibodies (IgG) against these cells and ensuing destruction of the cells.
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A dangerous allergy response A Dangerous Allergy Response. An allergic reaction is your body’s response to a substance that it deems dangerous or potentially deadly. Spring allergies, for example, are a mild, common allergy often caused by pollens or grasses. A more deadly type of allergic response is possible, too. Anaphylaxis is a severe and sudden allergic reaction.
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- Patient Comments Read 6 Comments Share Your Story. 1  An allergic reaction is the body's way of responding to an invader.. 2  When the body senses a foreign substance, called an antigen, the immune system is triggered.
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Possible Causes of Allergic Reaction on Your Face Anaphylaxis is the most severe type of allergic reaction you can have. Anaphylaxis or anaphylactic shock is the extreme reaction of your immune system to an allergen. Your body begins to shut down. The symptoms of anaphylaxis include: tightness in the throat and chest; swelling of the face, lips, and throat; hives or a red rash throughout areas of the body
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- Adverse reaction: In pharmacology, any unexpected or dangerous reaction to a drug. An unwanted effect caused by the administration of a drug. The onset of the adverse reaction may be sudden or develop over time. Also called an adverse drug event (ADE), adverse drug reaction (ADR), adverse effect or adverse event.
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Allergies Anaphylaxis (anna-fih-LACK-sis) is a serious allergic reaction that is rapid in onset and may cause death. Symptoms usually involve more than one organ system (part of the body), such as the skin or mouth, the lungs, the heart, and the gut. Some symptoms include:
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injection site reaction injection site reaction. An allergic, histaminic, or traumatic response of the skin and subcutaneous tissues to any substance introduced with a needle. Patient care. The injection site should be carefully monitored for redness, swelling, necrosis, or purulence. The size of any injury should be measured and the patient's level of pain assessed. Management may depend on the nature of the introduced substance. In mild cases, topical application of a cold pack may alleviate symptoms.