Which type of asthma is the most common, IgE-mediated, and triggered by environmental allergens?

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Allergic (atopic) asthma is the IgE-mediated form of asthma driven by environmental allergens. In atopy, individuals become sensitized to common triggers like dust mites, pollens, and animal dander, producing specific IgE antibodies that bind to mast cells. When the allergen is encountered again, it cross-links these IgE molecules, triggering mast cell degranulation and release of mediators such as histamine and leukotrienes, leading to bronchoconstriction, airway edema, mucus production, and eosinophilic inflammation. This pathway explains why this phenotype is the most common and why positive allergen sensitization tests are often seen. Other types lack this IgE-mediated allergen sensitization: nonatopic asthma does not involve IgE changes with triggers like infections or irritants; occupational asthma centers on workplace exposures and may be IgE-related but is defined by the exposure; exercise-induced asthma is primarily triggered by exertion due to airway cooling and drying rather than allergen sensitization.