Menstrual irregularities frequently affect the quality of life of females. Such disorders have economic consequences in terms of health care costs due to the consumption of expensive hormonal drugs and laboratory tests. Aims and Objectives: 1. To find out the prevalence of menstrual irregularities among female medical students (first year to final year) of AllamaIqbal Medical College, Lahore. 2. To find the factors associated with menstrual irregularities among female medical students (first year to final year) of Allama Iqbal Medical College, Lahore. Study Design: Cross sectional study Study Setting and Duration: The research was conducted on female medical students (first year to final year) of AllamaIqbal Medical College, Lahore in a duration of one month (April to May). Results: This research shows that out of 200 female medical students 71 (36%) suffer from menstrual irregularities. Of these 71 females 46(65%) have moderate, 9 (13%) low & 16 (23%) high stress score. There were 24 (34%) females who didn't exercise regularly and 18 (25%) didn't exercise at all. 48 (68%) interviewees with irregular cycle length consume junk food 1-2 times/week. Females who didn't consume junk food at all didn't develop menstrual irregularities. Conclusions: The research shows that there is an association of irregular menstrual cycle & more stress, Less exercise and junk food. However no such association could be established with BMI.