The author diagnosed cough, emphysema and the symptoms characteristic for the bronchial asthma in 43% of patients with seasonal allergy (rhinitis, conjunctivitis) to pollens. Such symptoms were more frequent (51% of cases) in patients allergic to the grass pollens with coexisting hypersensitivity to Compositae family. Asthmatic symptoms in patients allergic only to grass pollens were seen in 38%. The author suggests that prolonged exposition in the inhalatory allergens (from two to four-five months) plays an important role in asthma onset in such patients. It rather delays than accelerates admittance to allergic clinics.