Tehran University of Medical Sciences Basic & Clinical Cancer Research 2228-6527 5 1&2 2013 01 01 21 26 Mitra Zolfaghari School of Nursing and Midwifery, Tehran University of Medical Science, Tehran, Iran Fatemeh Bahramnezhad School of Nursing and Midwifery, Tehran University of Medical Science, Tehran, Iran Zohreh Parsa-Yekta School of Nursing and Midwifery, Tehran University of Medical Science, Tehran, Iran Anooshirvan Kazemnejad Department of Biostatistics, Tarbiat Modares University, Tehran, Iran. Zahra Monjamed School of Nursing and Midwifery, Tehran University of Medical Science, Tehran, Iran 2014 04 24 2014 09 28 Background: Life style is an important element to prevent the cancer. Therefore, this study aimed to determine life style risk factors of Tehran citizens as well as to prevent cancer. Methods: This study is a descriptive - analytic research with Sample size of 2500 Tehran citizens. The study data was collected via a questionnaire that contained 2 parts: demographic and questions related to life style cancer. Its validity and reliability was determined through content validity and Alfa-Cronbach test. Data was collected in one time and in front of the interviewer. Data analysis was done by SPSS software and descriptive and inferential statistics. The participants’ life style was assessed at three levels of satisfactory level 80-100%, moderately satisfactory level 60-79/9% and not satisfactory level0%-59/9%. Results: 40/4% of the subjects had no direct contact with sunlight. 62% of the subjects had contact with the white matter. 45/8% have sometimes been nervous. 46/7% of the civilian population of normal BMI ha  poor lifestyle. Conclusion: Since studied Tehran citizens’ life style associated with cancer prevention were not desired in most aspects, life style correction can prevent the cancer to a great extent. It is essential that health and medical authorities specially nurses plan to reform life style, health behaviors and individuals’ habits. https://bccr.tums.ac.ir/index.php/bccrj/article/view/122 https://bccr.tums.ac.ir/index.php/bccrj/article/download/122/002