Background & Objectives: Experience of chronic stress in children, has a significant role in developing future physical, mental and social problems. It is critical that families, teacher and professional group have the ability to detect the signs of stress in children.According to statistics published by the Ministry of Education in 2008-09 there are about 5.5 million children in elementary schools of Iran. Meanwhile few studies have been done on stress in children ages 7-12. The aims of this study were, therefore, to assess stress symptoms in elementary school-aged children.Materials & Methods: In this descriptive research we included 839 Tabriz elementary school students in grades 3-5. First, the schools were selected using quota sampling from 5 education zones of Tabriz, then the students were selected using simple random sampling from these schools. Data gathering tool was Children Stress Symptoms Scale (CSSS) implemented through individual interview after content translation, validity and reliability using test re-test. Data were analyzed using percentage, absolute frequency and SPSS software.Results: All of the 26 items of the employed questionnaire were reported as stress symptoms by children. More than half of the students reported worry, tachycardia, fear, trembling and grieving. Meanwhile 46.6% had reported headache and 41.8% of them had reported tiredness. There was significant relationship between variables of gender, grade and type of school and any signs of stress.Conclusion: Children react in different ways to stress. Recognizing these symptoms will allow parents, teachers and professional staff to know of student’s physical and mental status and may lead to intervention to reduce their stress.