This study contains all you need about childhood asthma including: epidemiology and risk factors, pathogenesis, types, history, examination, investigations, classifications, prevention and treatment. It also compare the efficacy of inhaled steroids and montelukast in control of mild presistent asthma and inhaled steroid plus montelukast to inhaled steroids plus inhaled long acting B-2 agonist in control of moderate and severe presistent asthma in children.