For the onset of childhood asthma synergize two factors: genetic, ie heredity, and environmental, that is the environment in which we live. There is a predisposition for the disease and the environment favors the onset. So to increase the prevalence implicated: a) genetic predisposition, b) the method of construction of houses, c) smoking (assets - liabilities), c) indoor pollution, d) atmospheric pollution, e) the modern way of eating and clothing and f) preventing illness by a large number of serious infections due to the widespread use of vaccines.Most asthma medications are administered using suitable inhalers. There are various types of devices that facilitate the administration of inhaled medications in young children. The correct use of inhalational devices is very important for the treatment of asthma. If the patient does not understand the instructions, the drug is deposited satisfactorily lungs, ie organ must act, so there is no remission.