eng Science and Education Publishing American Journal of Nursing Research 2378-5586 2019-04-20 7 3 365 374 10.12691/ajnr-7-3-18 AJNR20197318 article Nadia Abd Alhamid Attit Allah 1 Rehab Mohammed Abd Elhady 2 Amira Refaat Said amira.refaat21@yahoo.com 3 Maternity and Gynecological Nursing, Faculty of Nursing, Ain Shams University, Egypt , 3 Obstetrics and Woman's Health Nursing, Faculty of Nursing, Benha University, Egypt 2, 3 Obstetrics and Woman's Health Nursing, Faculty of Nursing, Benha University, Egypt Background: Premenstrual tension syndrome is one of the most common disorders in adolescent girls that could significantly interfere with activities of daily life. It refers to a group of expectable mood, behavioral, and physical symptoms that occurs 7-14 days before the onset of menstruation. The studies indicated that high proportion of adolescence suffering from PMS. So it is very important for these girls to determine efficacy of evidence-based program for increasing knowledge and decreasing the severity of PMS. Aim: Was to evaluate effect of evidence based program among adolescent nursing student’s regarding PMS. Quasi-experimental design: (pre and post intervention) was conducted. A total sample of (100) girls (All female students in the first and second grades) aged between 17 and 19 years, who suffered from PMS. Setting: The study was conducted at the Faculty of Nursing, Benha University. Data were collected through two main. Tools: A structured self-administered questionnaire, and self-practices daily activities toward PMS. Results: showed that, there was highly statistically significant difference in all items of knowledge & practices after application of the evidence-based program as compared with that before applying it. Meanwhile, after training program, there was a significant improvement in the student’s body weight after applying program compared with that before applying it, the mean weight pre -program was 77.4 +5. 8Kg, while the mean weight post -program was 68.89+6.332 Kg. Conclusion: Overall, the findings revealed that, the evidence-based program had a possible positive beneficial effect on increasing knowledge and decreasing PMS signs and symptoms severity. Also, the evidence based program has decreased the effect of PMS S & S on study group life. Thus, the study recommended that continuing health education program about PMS that aimed at understanding signs & symptoms of PMS which emphasize on self-care measures and life style modifications. http://pubs.sciepub.com/ajnr/7/3/18/ajnr-7-3-18.pdf premenstrual syndromes evidence-based adolescent girls student’s knowledge and practices