en Descriptive & Survey <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="background:white"><span cambria="" style="font-family:">Aims:</span></span></b><span style="background:white"><span cambria="" style="font-family:"> In some studies, obesity has been linked to pediatric thyroid disorders; This relationship can lead to many risks in children; Because both of these diseases have side effects that can occur more severely together; High blood pressure, disorders of the immune system, as well as cardiovascular disease occur in children who are obese and have thyroid disorders 16 times more often than normal children; The aim of this study was the relationship between hypothyroidism and body mass index in children.</span></span></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="background:white"><span cambria="" style="font-family:">Instrument & Methods:</span></span></b><span style="background:white"><span cambria="" style="font-family:"> This is a cross-sectional descriptive study that was conducted during 2019 in Tabriz General Medical University with the participation of 100 children. Demographic information, body mass index, T4, TF4, T3 and FT3 were recorded for all children and the relationship between body mass index and thyroid test status was assessed.</span></span><span style="background:white"><span style="font-family:"Cambria",serif"></span></span></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="background:white"><span cambria="" style="font-family:">Findings:</span></span></b> <span cambria="" lang="EN" style="font-family:">The children participating in the study were divided according to body mass index. They were also divided according to the amount of thyroid hormones. The results showed that the higher the body mass index, the lower the thyroid hormones; In other words, the results showed that hypothyroidism leads to obesity in children.</span><span style="background:white"><span style="font-family:"Cambria",serif"></span></span></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="background:white"><span cambria="" style="font-family:">Conclusion:</span></span></b> <span cambria="" lang="EN" style="font-family:">In all cases of subclinical hypothyroidism in children, following which thyroid function returns to normal, re-evaluation at older ages, especially during adolescence or pregnancy, is necessary.</span><span style="background:white"><span style="font-family:"Cambria",serif"></span></span></span></span></span><br> &nbsp; Hypothyroidism, Body Mass Index, Children 127 131 http://gmedicine.de/browse.php?a_code=A-10-1-31&slc_lang=en&sid=2 L. Saboktakin 10031947532846001364 10031947532846001364 Yes “Tuberculosis and Lung Disease Research Center” and “Department of Otorhinolaryngology”, Tabriz University of Medical Sciences, Tabriz, Iran