The observations of 427 children with bronchial asthma (BA) have established growing value of physical irritants, neuro-psychic stress, plant pollen with the increase of patients’ age, long standing development of the disease and severity of BA. The number of patients with the reaction to the pet hair increases and those reacting to food allergens decrease with age. The reaction to smell of chemicals and significance of respiratory infections do not depend practically on severity, long standing development of the disease and age of the patients.
