what is allergies?
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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 problem in most people.
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Allergic rhinitis Allergic rhinitis, also known as hay fever or pollinosis, is a condition which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose is usually clear.
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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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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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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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- Appointments & care. At Mayo Clinic, we take the time to listen, to find answers and to provide you the best care. Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — that doesn't cause a reaction in most people.
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Top Allergy Terms Allergy: A severe response to a substance or condition. It happens when your body produces and releases histamine or histamine-like substances. Allergy index: A measure of people with allergies in your region who are affected by pollen. Since some types of pollen are more likely to cause allergies than others, a high allergy index doesn’t always mean there’s a high pollen count. Allergy shots: See Immunotherapy. Anaphylaxis: A severe, life-threatening allergic response that may include lowered blood pressure, swelling, and hives.
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Homeopathy: Allergies â The Soulâs Cry for Help? Allergies are abnormal immune system reactions to things that are typically harmless to most people. When you're allergic to something, your immune system mistakenly believes that this substance is harmful to your body. In an attempt to protect the body, the immune system produces IgE antibodies to that allergen.
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allergy Definition of allergy for English Language Learners. : a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people.
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Allergy 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. Common allergens include pollen and food.
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- Allergies are an abnormal response of the immune system. People who have allergies have an immune system that reacts to a usually harmless substance in the environment. This substance (pollen, mold, and animal dander, for example) is called an allergen. Allergies are a very common problem, affecting at least two out of every 10 Americans.
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""" Why are my allergies worse in the spring? """ I am26 and my allergies are out of control in the spring. What gives? Allergic rhinitis, also know as seasonal allergies or hay fever, is a common condition that affects thousands of Americans. The physiologic process behind allergies is actually an abnormal response of the immune system to a harmless substance.
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Allergic Rhinitis Allergic rhinitis, or hay fever, is an allergic response to specific allergens. Pollen is the most common allergen in seasonal allergic rhinitis. These are allergy symptoms that occur with the change of seasons.
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Allergy (Allergies) 1 Allergy involves an exaggerated response of the immune system, often to common substances such as foods or pollen. 2  The immune system is a complex system that normally defends the body against foreign invaders, such as bacteria and viruses, while also surveying for conditions such as cancer and autoimmunity.
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Food Allergies and Your Skin A food allergy occurs when your immune system responds defensively to a specific food protein that, in reality, is not harmful to the body. The first time you eat the offending food, the immune system responds by creating specific disease-fighting antibodies (called immunoglobulin E or IgE).
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Allergy Facts Allergy Facts Asthma and allergic diseases, such as allergic rhinitis (hay fever), food allergy, and eczema, are common for all age groups in the United States. Asthma affects more than 17 million adults and more than 7 million children.1.
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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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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.llergens can be found in a variety of sources, such as dust mite excretion, pollen, pet dander or even royal jelly. Food allergies are not as common as food sensitivity, but some foods such as peanuts (a legume), nuts, seafood and shellfish are the cause of serious allergies in many people.
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- An allergy is an abnormally high sensitivity to a specific substance, such as dust, pollens, foods, or drugs. Symptoms of allergies commonly include inflammation, sneezing, itching, and skin rashes.n allergy is an abnormally high sensitivity to a specific substance, such as dust, pollens, foods, or drugs. Symptoms of allergies commonly include inflammation, sneezing, itching, and skin rashes.
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Top 30 Doctor insights on: Duration Of Allergic Reactions Allergies (Definition) Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and can be very serious. ...Read more.
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- An allergy is an abnormal, acquired sensitivity to a given substance, including pollen, drugs, food, venom or numerous other environmental triggers. An allergy is a local or systemic inflammatory response to allergens. Often times symptoms are swelling of the nasal mucosa, itchy burning eyes, sneezing, wheezing, fullness in the ears and various skin rashes such as hives, or anaphylaxis, a potentially fatal reaction.
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- An allergy is basically an overreaction by your immune system to a protein that it perceives as a threat — for example, the proteins in particular types of food, the dust mite protein, or pollen. For people without allergies, these proteins are harmless.
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Immunologic Tolerance Anergy An absence of cell-mediated immune reaction in supposedly sensitized animals or individuals. 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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History of North Carolina North Carolina adopted a new state constitution in 1835. One of the major changes was the introduction of direct election of the governor, for a term of two years; prior to 1835, the legislature elected the governor for a term of one year. North Carolina's current capitol building was completed in 1840.
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Overview A drug allergy is the abnormal reaction of your immune system to a medication. Any medication — over-the-counter, prescription or herbal — is capable of inducing a drug allergy. However, a drug allergy is more likely with certain medications. The most common signs and symptoms of drug allergy are hives, rash or fever. A drug allergy may cause serious reactions, including anaphylaxis, a life-threatening condition that affects multiple body systems.
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Overview Food allergy is an immune system reaction that occurs soon after eating a certain food. Even a tiny amount of the allergy-causing food can trigger signs and symptoms such as digestive problems, hives or swollen airways.n some people, a food allergy can cause severe symptoms or even a life-threatening reaction known as anaphylaxis. Food allergy affects an estimated 6 to 8 percent of children under age 3 and up to 3 percent of adults.