Women of reproductive age frequently struggle with menstrual issues. Patients with these diseases and their families may experience severe anxiety. One of the common causes of irregular menstruation is thyroid disease. The study aimed to identify the prevalence of hypothyroidism in women of reproductive age, describe the condition's numerous clinical manifestations, and evaluate the menstrual cycle of those who had the condition. Methodology: This was a cross-sectional study conducted between May 2022 to April 2023 in the urban field practice area of Kancheepuram district, Tamilnadu. A total of 250 women of reproductive age group were selected using simple random sampling. The study variables were age, education occupation, socio-economic class, various symptoms of hypothyroidism, and pattern of menstruation were all collected. The data were collected using an interviewer-administered pre-structured questionnaire and analyzed descriptively by using SPSS software. Results: The prevalence of hypothyroidism was estimated to be 15%. The most common menstrual abnormality was menorrhagia. The majority of the hypothyroidism had lethargy, constipation, and weight gain as their symptoms of concern. Nearly half 18(48.6%) of them had menorrhagia, followed by 14(37.8%) with oligomenorrhoea, 3(8.1%) with polymenorrhoea, and a minimum of 2(5.4%) with menometrorrhagia. Conclusion: The findings advocate for routine thyroid screening in women with menstrual disorders to ensure timely diagnosis and treatment thereby improving their quality of life and reproductive health outcomes