what is allergic reaction
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Dental Terms Allergic reaction: The hypersensitive response of the immune system of an allergic individual to a substance. When an allergen enters the body, it causes the body's immune system to develop an allergic reaction in a person with an allergy to it. This reaction can occur when the immune system attacks a normally harmless substance (the allergen). The immune system calls upon a protective antibody called immunoglobulin E or IgE to fight these invading substances.
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Inflammation An allergic reaction, formally known as type 1 hypersensitivity, is the result of an inappropriate immune response triggering inflammation, vasodilation, and nerve irritation. A common example is hay fever, which is caused by a hypersensitive response by mast cells to allergens.
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Medications and Drug Allergic Reactions These antibodies travel to cells that release chemicals, triggering an immediate allergic reaction. This reaction causes symptoms in the nose, lungs, throat, sinuses, ears, lining of the stomach or on the skin and usually occurs within minutes to a few hours of taking the drug. The most common immune response to a drug is due to the expansion of T cells, a type of white blood cell that recognize the drug as foreign.
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- Mechanism[edit] Allergies are an abnormal immune reaction. The human immune system is designed to protect the body from potential harm and in people who have allergies the immune system will react to allergens (substances that trigger an immune response).
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What is an Allergy? Allergic Reaction, Immune Hypersensitivity Allergic Reaction, Immune Hypersensitivity An allergy is an overactive immune response which is triggered when the body is exposed to some stimulus. This causes inflammation at the site of exposure or in other parts of the body and causes a range of symptoms, some of which can be life threatening.
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Allergies ANAPHYLAXIS: A Severe Allergic Reaction. 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: Skin rashes, itching or hives.
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Allergies An allergy occurs when the body’s immune system sees a substance as harmful and overreacts to it. The symptoms that result are an allergic reaction. The substances that cause allergic reactions are allergens. Allergens can get into your body many ways to cause an allergic reaction. 1  You can inhale allergens into your nose and your lungs. 2  You can ingest allergens by mouth. 3  Your body can have allergens injected into it.  Your skin can absorb allergens.
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What Is an Allergic Reaction? If you become exposed to an allergen for the first time, your symptoms may be mild. These symptoms may get worse if you repeatedly come into contact with the allergen. Symptoms of a mild allergic reaction can include: 1  hives (itchy red spots on the skin). 2  itching.3  nasal congestion (known as rhinitis). 4  rash.5  scratchy throat.f you become exposed to an allergen for the first time, your symptoms may be mild. These symptoms may get worse if you repeatedly come into contact with the allergen. Symptoms of a mild allergic reaction can include: 1  hives (itchy red spots on the skin). 2  itching.
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What Is an Allergic Reaction? Your immune system is responsible for defending the body against bacteria and viruses. In some cases, your immune system will defend against substances that typically don’t pose a threat to the human body. These substances are known as allergens, and when your body reacts to them, it causes an allergic reaction. You can inhale, eat, and touch allergens that cause a reaction. Doctors can also use allergens to diagnose allergies, and can even inject them into your body as a form of treatment.
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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.
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Limited company The private company equivalent in Australia is the Proprietary Limited company (Pty. Ltd.) An Australian company with only Limited or Ltd. after its name is a public company, such as a company listed on the ASX (although public companies can be, and often are, unlisted).rom Wikipedia, the free encyclopedia. In a limited company, the liability of members or subscribers of the company is limited to what they have invested or guaranteed to the company. Limited companies may be limited by shares or by guarantee.
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Anaphylaxis Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death. It typically causes a number of symptoms including an itchy rash, throat swelling, and low blood pressure. Common causes include insect bites and stings, foods, and medications.
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About Allergy An allergy is the response of the body's immune system to normally harmless substances, such as pollens, foods, and house dust mite.
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adverse reaction adverse reaction. n. A result of drug therapy that is neither intended nor expected in normal therapeutic use and that causes significant, sometimes life-threatening conditions. Reeve passed away after experiencing an adverse reaction to an antibiotic on Oct. 10, 2004.
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- An allergy is a response by the body's immune system to something (called an allergen) that is not necessarily harmful in itself. Certain people are sensitive to this allergen and have a reaction when exposed to it.llergies are the body's response to a substance called an allergen. Allergens themselves may not be harmful. However, in some people, things that are usually harmless can provoke a reaction. Allergic reactions vary and include many different symptoms.
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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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- 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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Allergic Reaction These antibodies travel to cells that release chemicals, causing symptoms most often in the nose, lungs, throat, sinuses, ears, lining of the stomach or on the skin. The first time a person with an allergy is exposed to the allergen, it may not cause a reaction. However, the person is then sensitized to the allergen can and even minor future exposures to this allergen produce an allergic reaction. Anaphylaxis (an-a-fi-LAK-sis) is a serious allergic reaction involving multiple parts of the body.
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Allergic Reaction 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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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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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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Allergic Reaction 1 Most allergic reactions are minor, such as a rash from poison ivy, mosquito or other bug bites, or sneezing from hay fever. The type of reaction depends on the person's immune system response, which is sometimes unpredictable.  In rare cases, an allergic reaction can be life-threatening (known as anaphylaxis).
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Allergies Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or to a food that doesn't cause a reaction in most people. Your immune system produces substances known as antibodies. When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn't. When you come into contact with the allergen, your immune system's reaction can inflame your skin, sinuses, airways or digestive system.
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- An allergy occurs when you react to things like pollen and cats that don’t affect most people. If you come into contact with something you are allergic to (called an allergen), you may have symptoms. This is called an allergic reaction.
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What Is an Allergic Reaction? If you become exposed to an allergen for the first time, your symptoms may be mild. These symptoms may get worse if you repeatedly come into contact with the allergen. Symptoms of a mild allergic reaction can include: 1  hives (itchy red spots on the skin). 2  itching.
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allergy Full Definition of ALLERGY. 1. 2. : exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual. 3. : medical practice concerned with allergies. 4.