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Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. [11] These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. [1]
Is it a food allergy, sensitivity or intolerance? Here's how to tell, according to experts.
Types of allergens. Allergens can be found in a variety of sources, such as dust mite excretion, pollen, pet dander, or even royal jelly. [2] 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.
A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure.
Bacterial and viral infections can cause allergy-like symptoms, as can anatomical issues like a deviated septum. Some people are also sensitive to irritants like cigarette smoke and perfume, but ...
Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. [1] [2] It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity. It is caused by many types of particles and ...
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