Myths vs facts: Östradiol and Allergie

The relationship between estradiol and allergies is complex and often misunderstood. Estradiol, the primary form of estrogen, can modulate the immune system in multiple ways. It can influence mast cell activity and histamine release, potentially worsening allergic symptoms in some women during the premenstrual phase or pregnancy. At the same time, estradiol has anti-inflammatory properties and can affect IgE antibody production. Epidemiological data show higher allergy prevalence in women, suggesting a hormonal component. However, evidence is mixed: some observational studies link high estradiol levels with increased allergy risk, while others find no association or even a protective effect. Individual genetics, microbiome composition, and environmental exposures are equally important. Therefore, it is a myth that estradiol alone causes allergies. The fact is: estradiol can modulate allergic responses, but the effect is context-dependent and not predictable. Women considering hormone therapy should monitor allergy symptoms and consult a physician. Overall, the evidence is moderate and based on observational and mechanistic studies, not large randomized trials.