Introduction: Thyroid disorders, affecting approximately 42 million individuals in India, pose significant public health concerns. This study focuses on determining the prevalence of undetected hypothyroidism and associated risk factors among adults in Odisha, India. Methods: A cross-sectional study at SLN Medical College, Odisha, involved 970 participants aged 20-70 years. Demographic data, symptoms, and TSH levels were recorded. Regression analysis assessed risk factors, and Anti-TPO antibodies were tested in a subset. Results: Undetected hypothyroidism prevalence was 16.8%, higher than previous studies. Females exhibited a higher prevalence (19.1%) than males (10.2%). Regression analysis identified gender and symptoms as significant correlates. Anti-TPO positivity was 94.8% in subjects with elevated TSH. Discussion: The prevalence increase suggests a growing health concern. Regional variations and environmental factors, including thyroid disruptors, demand further investigation. The impact on reproductive health emphasizes the need for early detection. Conclusion: Undetected hypothyroidism remains a prevalent issue in Odisha, with autoimmune factors playing a substantial role. Addressing this condition is crucial for enhancing population health and productivity.