Chronic allergic diseases are often caused by infections that can form chronic foci in various organs. If the focus of chronic infection is in the intestine, then allergic (more correctly called pseudo-allergic) reactions can be on the skin, and if the focus of infection – in the bronchi, this may be accompanied by manifestations of asthmatic bronchitis or bronchial asthma. If a pseudo-allergic reaction exists for some time (from several weeks to several years), as a result of sensitization of the body, the immune response fails, and a true (IgE or IgG-mediated) allergy develops when a perversely enhanced immune response to some factor ( antigen), while the allergy caused by some parasite can transform into food or polynosis. In the presence of chronic allergic pathology, it is necessary to conduct a number of examinations: a study of intestinal microflora (feces for dysbiosis), because It is from the intestine and normal microflora that the main antiallergic protection is carried out; prophylactic deworming (helminthic infestations are difficult to detect, and the use of anthelmintic drugs for prophylactic purposes is harmless); blood tests for allergic antibodies (IgE or IgG); and necessarily for infections such as chlamydia, mycoplasmas – M. pneumoniae, Trichomonas (blood for antibodies).