AbstractBackground: The relation between menstrual irregularities and thyroid disorders are attributed to multiple mechanisms. Menstrual disturbances may accompany and even may precede thyroid dysfunction. In the present study thyroid status of patients presenting with abnormal uterine bleeding was assessed by TSH, T3, and T4 assay. Materials and methods: The present study was a hospital based prospective study, conducted in the Department of Obstetrics and Gynecology department of Tertiary care center during 1st June 2016 to 31st June 2018. The study group was comprised of women attending Obstetrics and Gynecology department, presenting with menstrual disorder. Results: Patients with age less than or equal to 20 years, most common bleeding pattern was oligomenorrhoea (50%). Followed by Hypomenorrhoea (25%) and menorrhagia (9%) Oligomenorrhoea was present in 40 (32%) of the cases in age group 21- ≤ 30 years. Conclusion: Abnormal uterine bleeding is frequently seen to be associated with thyroid dysfunction and in majority of the patients, menstrual abnormality may even precede the occurrence of other clinical signs and symptoms of thyroid dysfunction.