Objective: to study the immune mechanisms of inflammation of the patients with BA in association with type 2 diabetes mellitus (DM). Materials and methods: the study involved 215 patients with persistent BA of moderate severity at the age of (28.6±2.4) years, including 88 men (40.9%), 127 women (59.1%). Among the examined patients with BA there were 64 — group I, persons with BA in association with type 2 diabetes — 151 (group II), in whom, along with routine laboratory and instrumental methods, cellular immunity, IgE and lymphocytic autoantibodies were determined. Results: patients with BA in combination with type 2 diabetes more often have an uncontrolled course of the disease with a complication in the form of grade II respiratory failure. In patients with BA, as well as with BA in combination with type 2 diabetes, the formation of secondary immunodeficiency due to the cellular link was noted. The combination of BA and type 2 diabetes is characterized by the most pronounced negative changes in cellular immunity among all examined patients. In BA in combination with type 2 diabetes, a decrease in the concentration of IgE was noted along with an increase in the number of lymphocytic autontibodies. Conclusion: patients with BA in combination with type 2 diabetes have a more severe course of BA and the addition of a more destructive autoimmune to allergic inflammation, which increases the risk of complications of both diseases.