Background and objectives: Premenstrual syndrome (PMS) symptoms encompass a range of physical, emotional and behavioural symptoms that can significantly impact daily functioning and quality of life in women. Studies have shown variable findings between association of physical activity and Body mass index (BMI) on PMS, although the evidence remains inconclusive. This study aims to assess the correlation between habitual physical activity and Body mass index (BMI) on PMS among medical students. Material and methods- A cross-sectional study was conducted including 83 female medical students in the age group of 18- 25yrs. BMI was calculated based on standard anthropometric measurements, PMS severity was assessed using Premenstrual syndrome scale (PMSS) and Habitual Physical Activity by International physical activity questionnaire (IPAQ)short form. Scoring of PMS and IPAQ was done and results were analysed using SPSS 26, Pearsons’s correlation coefficient was used to examine the association. Results-.The analysis revealed a statistically significant negative correlation between habitual physical activity and PMS (p=0.03) and no significant negative correlation between BMI and PMS (p=0.28)Conclusion- PMS symptoms is less in subjects with higher habitual physical activity.