Allergen – Definition and Common Allergens

What is Allergen and Definition A harmless substance, also called a hapten, that causes an exaggerated response from the immune system called a hypersensitivity reaction. For reasons researchers do not fully understand, the immune system produces antibodies for the substance that result in the immune response perceiving the substance as a foreign invader. When the allergen contacts or enters the body, […]

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Allergic Asthma Treatment and Symptoms

Definition of Allergic Asthma A hypersensitivity reaction (allergic reaction) that involves the airways (bronchi). allergic asthma is a type i or immunoglobulin e (ige) reaction. Mast cells in the bronchial membranes release histamine, prostaglandins, and leukotrienes. These substances cause itching and swelling of the bronchial membranes, resulting in wheezing and the sensation of chest tightness. Cockroach droppings are the most frequent cause of allergic asthma. […]

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Allergic Conjunctivitis Symptoms and Treatment

Allergic Conjunctivitis Definition and Symptoms Allergic conjunctivitis – A type I (immunoglobulin e [ige]) hypersensitivity reaction, commonly called an allergic reaction, that affects the membranes that line the inner eyelids (conjunctiva). Sometimes the irritation also reddens the white part of the eye (sclera). Allergic conjunctivitis features red and swollen conjunctiva with excessive tearing and itching of the eyes […]

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Allergic Dermatitis Symptoms and Treatment

Allergic Dermatitis Definition Allergic dermatitis is a hypersensitivity reaction (allergic reaction) that affects the skin, usually in response to contact with an allergen. As with all hypersensitivity reactions, the first exposure to the allergen produces no symptoms. In reaction to the exposure, however, the immune system produces antibodies for the allergen. Subsequent exposures to the allergen then do produce symptoms. […]

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Allergic Rhinitis – Symptoms and Treatment

Definition of Allergic Rhinitis Allergic Rhinitis is a hypersensitivity reaction to inhaled allergens – also called seasonal rhinitis or hay fever, affects the mucous membranes inside the nose (nasal mucosa). Allergic rhinitis affects about 40 million adults in the United States, making it one of the most common hypersensitivity reactions. The condition tends to develop in childhood and […]

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