Menstrual irregularities pose serious problems for women's quality of life and contribute to anxiety in reproductive age group and many underlying reasons responsible for this and the most important one changes in the BMI so this study aim to found if menstrual irregularities effected by BMI. In a cross-sectional study, 91 women who were admitted to an outpatient clinic served as the participants. The three categories employed in this study were: underweight (<18.4kg/m2), normal weight (18.5-22.99kg/m2), overweight (23-27.49kg/m2), and obese (over27.50kg/m2). To analyze the effects of various factors on these groups, estimates of the number, percentage, proportion, and chi-square were used. P-values less than 0.01 were considered to be very significant. According to our data, 12 women were underweight, while 7 women had a BMI under 30, making up the smallest category. A total of 46 women had an overweight body mass index. According to our findings, the age group of 18–29 years had the highest BMI (severe obesity). All age groups had low body weights (BMI 18.5) in equal percentage. Body mass index (BMI) and various age groups did not have a statistically significant association, p-value (0.536). With a p-value of 0.18, the association between BMI and dysmenorrhea was not statistically significant. There is no relationship between the various body mass index (BMI) categories and irregular menstrual cycles. Our data also revealed that there is no connection between BMI and menstrual cycles including (duration, amount of blood loss and dysmenorrhea) or between BMI and age of the various groups.