Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or 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 … See more Allergy symptoms, which depend on the substance involved, can affect your airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, … See more You might be more likely to develop an allergy if you: 1. Have a family history of asthma or allergies,such as hay fever, hives or eczema 2. Are a child 3. Have asthmaor another … See more An allergy starts when your immune system mistakes a normally harmless substance for a dangerous invader. The immune system then produces antibodies that remain on the alert for that particular allergen. When … See more Having an allergy increases your risk of certain other medical problems, including: 1. Anaphylaxis.If you have severe allergies, you're at increased risk of this serious allergy-induced reaction. Foods, medications and … See more WebMost severe allergic reactions occur within seconds or minutes after exposure to the allergen. Some reactions can occur after several hours, particularly if the allergen causes a reaction after it has been eaten. In very rare cases, reactions develop after 24 hours. Anaphylaxis is a sudden and severe allergic reaction that occurs within minutes ...

ALLERGY English meaning - Cambridge Dictionary

WebAllergic reaction An inappropriate or exaggerated genetically determined reaction to a chemical that occurs only on the second or subsequent exposures to the offending agent, after the first contact has sensitized the body. Mentioned in: Dermatitis, Eyelid Disorders Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. WebJan 1, 2024 · Definition. A food allergy triggers an allergic reaction when someone’s immune system reacts to certain proteins in food. ... Ingredient lists and food labeling are … fireplaces and wood stoves in gravette

Allergen Definition & Meaning Dictionary.com

WebAn allergy occurs when your immune system overreacts to the “foreign” substance. In the case of an allergy, substances that are usually harmless and don’t bother some people, such as dust or animal dander, do bother you! Webnoun Immunology. any substance, often a protein, that induces an allergy: common allergens include pollen, grasses, dust, and some medications. QUIZ There are … WebMedical Definition allergen noun al· ler· gen ˈal-ər-jən : a substance that induces allergy inhaled allergens a suspected food allergen More from Merriam-Webster on allergen … fireplaces at lowes