en بهداشت Health پژوهشي Original Article <p style="text-align: justify;">Background and purpose: Providing health services in health centers is a challenging and risky&nbsp;job. So that, realization of quality, performance, efficiency, and fairness in the provision of such&nbsp;services needs a proper condition to ensure that the stress experienced by the personnel is&nbsp;minimized. The present study is a survey of the factors effective on job stress among the nurses&nbsp;working in the educational hospitals affiliated with Tehran Medical Science University, Iran.<br> Materials and Methods: The study was conducted as a correlative work with a sample size of&nbsp;180 nurses. A researcher-designed questionnaire was used as data gathering tool. The validity of&nbsp;which was confirmed by the experts and its reliability was ascertained using Cronbach&rsquo;s alpha&nbsp;(&alpha = 0.92). The data were analyzed in SPSS using descriptive statistics such as central indices&nbsp;and inferential statistics including Pearson correlation coefficient.<br> Results: Mean score of the physical environment (1.96), occupational conflict (1.97), and&nbsp;ambiguity of role (2.20) were less than the average score. In addition, there was a statistically&nbsp;significant relationship between physical environment, occupational conflict, and ambiguity of&nbsp;roles on one hand and the stress experienced by the nurses on the other hand (P < 0.05).<br> Conclusion: Given the significant relationship between physical environment, occupational&nbsp;conflict, and ambiguity of roles on one hand and the nurse&rsquo;s stress, on the other hand,&nbsp;improvement of the environmental problem and assigning tasks that are more specific can be&nbsp;greatly helpful in improvement of the work condition.</p> Job Stress, Nurses, Hospitals 33 39 http://jhs.mazums.ac.ir/browse.php?a_code=A-10-466-3&slc_lang=en&sid=1 Ali Ayoubian 10031947532846004688 10031947532846004688 No Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran Hoda Fallahdar 10031947532846004689 10031947532846004689 No Department of Health Services Management, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Zahra Hashemi-Dehaghi 10031947532846004690 10031947532846004690 No South Tehran Branch, Islamic Azad University AND Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran Fatemeh Khoshnavay-Foumani 10031947532846004691 10031947532846004691 No Department of Nursing, School of Nursing, Tehran University of Medical Sciences, Tehran, Iran Donya Sheibani-Tehrani abi_6891@yahoo.com 10031947532846004692 10031947532846004692 Yes Department of IT Management, School of Management, Shahid Beheshti University, Tehran, Iran