IntroductionA healthy lifestyle can reduce the rate and symptoms of premenstrual syndrome. Thus, the present study evaluates the effect of educational intervention based on the Health Belief Model on the lifestyle related to premenstrual syndrome and reduction of its symptoms among the first-grade high school girls.MethodsThis quasi-experimental study was conducted on 80 first-grade high school girls. They were divided into two intervention and control groups (40 people in each group). The data collection tools included the participants’ demographic information questionnaire, premenstrual symptoms screening tool, and a researcher-made questionnaire based on the constructs of the health belief model about PMS and the behaviors reducing its symptoms. Data were collected in two phases (before and three months after the educational intervention) via WhatsApp. Educational sessions were held in the form of four 45-min sessions for intervention group subjects regarding PMS and the behaviors that reduce its symptoms during one month via WhatsApp.ResultsAccording to the results of this study, the mean scores of knowledge about PMS and health belief model constructs (including perceived susceptibility), perceived severity, perceived benefits, perceived self-efficacy, cues to action, lifestyle/behaviors that reduce PMS symptoms) and the percentage of people who did not have PMS symptoms or had a mild type of PMS increased significantly after implementing the educational intervention in the intervention group compared to before the intervention and compared to the control group. Also, the perceived barriers construct score PMS decreased significantly.ConclusionsThe health belief model education focused on a healthy lifestyle was effective in reducing PMS symptoms. It is recommended to use the educational intervention designed in this study, along with other health care in schools and during puberty as an easy, low-cost, and effective intervention.Supplementary InformationThe online version contains supplementary material available at 10.1186/s12889-023-15950-y.