What should I know about wie entsteht eine allergie?

Allergies develop through a dysregulated immune response. Upon first contact with a harmless environmental substance (allergen) – such as pollen, dust mites, or food proteins – genetically predisposed individuals undergo sensitization: the immune system produces specific IgE antibodies against the allergen. These antibodies bind to mast cells and basophils. Upon re-exposure, allergens cross-link the IgE molecules, triggering release of histamine, leukotrienes, and other inflammatory mediators – causing symptoms like sneezing, itching, swelling, or breathing difficulty. Development is influenced by environmental factors: early microbial exposure (hygiene hypothesis), diet, gut microbiome, and pollutants. Genetic variants in genes like IL-4, IL-13, or FCER1A can increase risk. Direct-to-consumer DNA tests (e.g., MyBody-X) can analyze such risk variants, but they do not replace clinical allergy diagnostics (skin prick test, specific IgE measurement). Evidence for individual SNPs is mostly moderate (GWAS), not sufficient for clinical prediction. Important: a confirmed allergy requires medical evaluation, especially if anaphylaxis risk exists.