Introduction: Obesity in women is worldwide problem. Obesity may lead to hyper androgenism resulting in increased extra glandular aromatization by adipocytes leading to anovulation and menstrual irregularities.

Aims and Objectives: To establish relation between obesity and menstrual irregularities in women and also to study the effect of weight reduction on menstrual pattern.

Materials and Methods – It is a  randomized prospective study of one year duration in the Dept. of Obstetrics and Gynecology, Calcutta National Medical College, Kolkata. Out of 198 obese females, 62 were presented with menstrual irregularities. Body mass index was calculated to detect obesity. Following investigations were done – serum FSH, LH, Prolactin, T₃, T₄, TSH, testosterone and USG of uterus and adnexa, diagnostic laparoscopy and endometrial biopsy. Result and Analysis: 31.3% of obese women had menstrual irregularities in our study. After reduction of 7–8 kgs, 80% of the women who had reduced weight also had menstrual improvement.

Conclusion: One third of the obese female patients presented with menstrual irregularities. Weight reduction by exercise and balanced diet reduced hyperandogenemia leading to ovulation which ultimately improved menstruation⁶.