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Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity.
Oral allergy syndrome (OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. It typically develops in adults with hay fever. It is not usually serious.
Immunology. Type I hypersensitivity (or immediate hypersensitivity ), in the Gell and Coombs classification of allergic reactions, is an allergic reaction provoked by re-exposure to a specific type of antigen referred to as an allergen. [1] Type I is distinct from type II, type III and type IV hypersensitivities.
Is it a food allergy, sensitivity or intolerance? Here's how to tell, according to experts. Skip to main content. Lifestyle. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
An analysis of pollen count data from 1990 to 2018 found that recent spring allergy seasons are kicking off about 20 days earlier, and pollen concentrations have increased by about 20%, especially ...
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 ...
Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.
CSID symptoms are frequent, daily events; they are lifelong, and they are postprandial (occurring after eating food). These symptoms can range from mild to severe and include chronic, watery, acidic diarrhea; intestinal gas and bloating; nausea; and abdominal pain.
Red, itchy, or watery eyes are common symptoms of seasonal allergies, but they're also signs of pink eye, or conjunctivitis. Here’s how to tell the difference.
Allergy and immunology: Symptoms: Stuffy itchy nose, sneezing, red, itchy, and watery eyes, swelling around the eyes, itchy ears: Usual onset: 20 to 40 years old: Causes: Genetic and environmental factors: Risk factors: Asthma, allergic conjunctivitis, atopic dermatitis: Diagnostic method