News tagged with allergy

Related topics: children · infectious diseases · immune system · vaccine · asthma

Helping keep children with food allergies safe

Beginning in the mid-1990s, doctors began to see a rise in food allergies among children. On average, 2 to 8 percent of children today have a food allergy, said Dr. Alice Hoyt, a University of Virginia Health System allergist.

May 01, 2017
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Ready for spring allergies?

(HealthDay)—Spring routinely spells misery for allergy sufferers, but a recent survey reveals that most patients don't try to manage their symptoms until it's too late.

Mar 30, 2017
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Are tree nut allergies diagnosed too often?

Many patients with a history of a single tree nut allergy are told to avoid all other tree nuts. But is that necessary? If you have a tree nut allergy and were advised to avoid other tree nuts based only on a positive blood ...

Mar 27, 2017
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Allergy

Allergy is a disorder of the immune system often also referred to as atopy. Allergic reactions occur to normally harmless environmental substances known as allergens; these reactions are acquired, predictable, and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity. It is characterized by excessive activation of certain white blood cells called mast cells and basophils by a type of antibody known as IgE, resulting in an extreme inflammatory response. Common allergic reactions include eczema, hives, hay fever, asthma, food allergies, and reactions to the venom of stinging insects such as wasps and bees.

Mild allergies like hay fever are highly prevalent in the human population and cause symptoms such as allergic conjunctivitis, itchiness, and runny nose. Allergies can play a major role in conditions such as asthma. In some people, severe allergies to environmental or dietary allergens or to medication may result in life-threatening anaphylactic reactions and potentially death.

A variety of tests now exist to diagnose allergic conditions; these include testing the skin for responses to known allergens or analyzing the blood for the presence and levels of allergen-specific IgE. Treatments for allergies include allergen avoidance, use of anti-histamines, steroids or other oral medications, immunotherapy to desensitize the response to allergen, and targeted therapy.

This text uses material from Wikipedia, licensed under CC BY-SA

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