Introduction & Objective: The present study is a case-control retrospective study. The purpose of the study is to determine the relationship between “endemic goiter "and “food habits "of governmental high school students of Khoy city.

 Materials & Methods: Target population in this research is divided into two groups: “case population " and "control population". Case population includes all the school girls who have goiter and control population includes all the girl students who do not have goiter. 120 subjects (60 case groups and 60 control group) were randomly selected from target population by cluster-sampling method. The information was obtained through one stage. Questionnaire and observational form were two means of data collection and descriptive and inferential statistics were used for analyzing the finding.