An allergy is a hypersensitivity disorder of the immune system. Symptoms include red eyes, itchiness, and runny nose, eczema, hives, or an asthma attack. 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 reactions called anaphylaxis. Food allergies and reactions to the venom of stinging insects such as wasps and bees are more often associated with these severe reactions. Not all reactions or intolerances are forms of allergy. Allergic reactions occur when a person’s immune system reacts to normally harmless substances in the environment. A substance that causes a reaction is called an allergen. These reactions are acquired, predictable, and rapid. Allergy is one of four forms of hypersensitivity and is formally called type I (or immediate) hypersensitivity. Allergic reactions are distinctive because of excessive activation of certain white blood cells called mast cells and basophils by a type of antibody called immunoglobulin E (IgE). This reaction results in an inflammatory response which can range from uncomfortable to dangerous. A variety of tests exist to diagnose allergic conditions. If done they should be ordered and interpreted in light of a person’s history of exposure as many positive test results do not mean a clinically significant allergy. Tests include placing possible allergens on the skin and looking for a reaction such as swelling and blood tests to look for an allergen-specific IgE. Treatments for allergies include avoiding known allergens, steroids that modify the immune system in general, and medications such as antihistamines and decongestants which reduce symptoms. Many of these medications are taken by mouth, although epinephrine, which is used to treat anaphylactic reactions, is injected. Immunotherapy uses injected allergens to desensitize the body’s response. Mild allergies like hay fever are very common.
Allergies
By Jamey Ekins
Jamey Ekins
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Hey there, I'm Jamey, and I've been an animal lover for as long as I can remember. Growing up on a 50-acre farm in Ontario, Canada, I was surrounded by a menagerie of furry friends, from beloved cats and dogs to goats, horses, cows, and even chickens. Now, I call Victoria, British Columbia my home, and my heart belongs to my adorable Balinese cat, Milo. When I'm not editing blog posts here at TechnoMEOW, I enjoy helping solo entrepreneurs with their passion projects and online marketing. Over the years, I've also ventured into creating and selling various blogs. Beyond the digital world, I'm an avid crochet and knitting enthusiast and share my crafty creations on my blog, doublecrochet.com.
Updated On June 5, 2024
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