Аннотация:Background: The rapid increase in the prevalence of type 1 hyper-sensitivity diseases in developed countries, especially among female patients, cause much concern. Moreover, now there is no review that covers the relationship between increased estrogen levels and a large number of different type 1 hypersensitivity reactions, namely: asthma, conjunctivitis, rhinitis, anaphylaxis, angioedema (Quincke ' s edema), food allergies, atopic dermatitis. The purpose of this study is to make a systematic research of the scientific literature in the PubMed database on the subject of the effects of female sex hormones (estrogens) on the development of 1 type hypersensitivity reactions. Method: A systematic research of the scientific literature was held in PubMed database, used full texts. Results: We made sure that the endocrine system is closely related and with the immune system and may greatly affect its function-ing. Estrogens are shown to up- regulate antigen- specific antibody- producing cells, switch classes of IgE, increase degranulation of mast cells and basophils, hence immunologically favour the development of a TH2- response. Conclusion: Published data in the literature indicate a correlation between the level of circulating estrogen in the blood and the fre-quency and severit y of hypersensitivit y reactions, however, an exact determination of the mechanisms of their mutual influence requires further research. The authors hope that the data obtained in the re-search aim are promising and will be used by practitioners and immu-nologists for a more accurate diagnosis, as well as for more effective treatment of allergic reactions using the principles of personalized medicine.