In any society, schools have crucial importance when it comes to improving social and interpersonal relationships and solving social problems. One of the best ways to solve social problems is to identify communication problems and provide training in communication skills from lower ages, particularly in primary school. Therefore, the present study poses the question: what interpersonal and social problems can be found in second-grade primary schoolchildren? This study has been conducted using the qualitative content analysis method with a summative approach. Analyzing interview transcripts with 20 teachers from three different school districts in the city of Tehran (Districts 15, 16, and 19) led to eight different categories identified for students' interpersonal and social problems: 1. problems regarding controlling emotions and creating tension, 2. problems arising in discourse or getting one's message across, 3. collaboration and teamwork problems, 4. problems in problem-solving and thinking, 5. character-wise problems, 6. self-protection problems, 7. problems in intrapersonal communication, and 8. weaknesses in making friends. From teachers' point of view, communication problems cannot be solved by providing students with instructions alone; some variables need to be taken into consideration and changed and revised significantly, such as harmony among different institutions (i.e. families, neighborhoods, school, the media, etc.), teachers' skills, the number of students, students' grade, how long training lasts, the adequacy of school personnel as well the education content itself.