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Background: Asthma and allergic diseases are raised as a major health problem in the world. The prevalence of these diseases is on the rise specifically in the world and Iran. Accordingly, the aim of this study was to assess the prevalence of these diseases in Jam City, from environs of Bushehr Province. Material and Methods: this study was performed on 516 schoolchildren aged 6-7 years and 569 schoolchildren aged 13-14 years in schools of this city based on a standard questionnaire of allergic conditions and asthma (ISAAC) phase 1 and 3, which mention to the prevalence and risk factors for these diseases in 2014. &nbsp;&nbsp;&nbsp; Results: in prevalence of atopic eczema, allergic rhinitis and asthma among 6-7year old schoolchildren were 13.8 %, 20% and 3.9%, respectively, While, the prevalence of these diseases among 13-14 year old schoolchildren were 19.5%, 19.2% and 6.7%, respectively. There were a significant association in each group, between affliction rate to asthmaand its association with rhinitis and eczema (P<0.05). Also, there were a significant association between the prevalence of these diseases and the presence of risk factors such as exposure to cigarette smoke, pet care and use of gas as a fuel at home. (P<0.05). Conclusion: the prevalence of asthma and allergic diseases was high in Jam city and this increase is associated to risk factors such as exposure to cigarette smoke, pet care and use of gas as a fuel at home.