Background: Premenstrual dysphoric disorder (PMDD) is a severe form of premenstrual syndrome (PMS) characterised by mood changes, anxiety and somatic symptoms experienced during the specific time of the menstrual cycle. Prevalence data of PMS and PMDD is sparse among young girls in India. Aim: To identify the Prevalence of premenstrual syndrome (PMS) and premenstrual dysphoric disorder (PMDD) among young females. Objectives: To identify the Prevalence of premenstrual syndrome (PMS) and premenstrual dysphoric disorder (PMDD) among young females and also To find out the association between sociodemographic profile and the occurrence of PMS/PMDD Materials and Methods: This cross sectional Study is conducted among 285 young females using simple random sampling method A cross sectional survey is conducted among young females , Which each individual will be approached and after getting informed consent , pre-menstrual syndrome symptoms screening test (PSST) tool along with socio demographic details Will be collected. The data received is documented and the scores will be analysed Results: The prevalence of PMS is 45.5% (36.4% for moderate to severe PMS and 9.1% for PMDD) among young females in our study. The symptoms commonly reported were depressed mood, anger/irritability and anxiety/tension. The common functional impairment was “your relationship with your family” PSST has 90.9% sensitivity, 57.01% specificity and 97.01% predictive value of negative test. Conclusion: The prevalence of PMS among the young females is slightly higher than compare to other studies from Asia. PSST is a useful screening tool for PMS. Routine screening with PSST can identify young girls who can improve with treatment.