SOCIODEMOGRAPHIC PATTERNS OF HYPERTHYROID PATIENTS UNDERGOING RADIOACTIVE IODINE THERAPY IN NORTHERN MALAYSIA: AN OBSERVATIONAL STUDY Introduction: Sociodemographic data of hyperthyroid patients undergoing RAI therapy remains limited. This study aims to assess the sociodemographic profile of hyperthyroid patients referred for RAI therapy in northern Malaysia. Methods: In this study, the participants involved were the hyperthyroid patients referred for RAI therapy at the Department of Nuclear Medicine, Hospital Pulau Pinang, from May 2019 to May 2020. Self-reported sociodemographic and clinical information were documented. Descriptive statistics were applied with continuous variables presented as mean and standard deviation and categorical variables as frequencies and percentages. Results: Among the 123 patients studied, the majority were female, with a mean age of 43.9 years. Most patients were of Malay ethnicity, hailing from Kedah, married, and acquired lower education. They were employed with an average monthly income of RM2303.88. The patients were primarily diagnosed with Graves’ disease without other comorbidities and were in a hyperthyroid state biochemically. A significant portion underwent RAI therapy for the first time, receiving a fixed cumulative dose of 555 MBq. Conclusions Overall, the sociodemographic patterns observed in this cohort align with established trends of thyroid disease related to age, gender, demographics, and etiology. However, the ethnic distribution contradicts previous literature, as Malay ethnicity exhibited the highest percentage of thyroid disorders in this study. Despite medical therapy, many patients had poor thyroid function control at the time of referral, necessitating RAI therapy for definitive management. Further, most patients had lower educational backgrounds, lower incomes, and were employed. Additionally, the presence of common non-communicable diseases in Malaysia was noted among the patients.