Adolescent girls are vulnerable to reproductive health problems, one of which is reproductive tract infection (RTI). Data from the Surakarta Health Office in 2024 showed that Jebres District had the highest number of RTI cases (15 cases) among adolescents aged 11–15 years. Reproductive tract infections can be prevented by implementing proper personal hygiene practices during menstruation. A preliminary study at SMP Negeri 8 Surakarta City showed that 7 out of 10 female students had poor menstrual personal hygiene behavior. Objective: To identify the characteristics of menarcheal age and describe menstrual personal hygiene behavior among adolescent girls at SMP Negeri 8 Surakarta City. Methods: This was a quantitative descriptive study using purposive sampling. The population consisted of 372 female students, with a sample of 79 respondents. Results: The majority of respondents experienced menarche at 11 years of age, comprising 34 respondents (43.0%). The majority of adolescent girls had good menstrual personal hygiene behavior, comprising 77 respondents (97.5%). Conclusion: Most adolescent girls at SMP Negeri 8 Surakarta City demonstrated good menstrual personal hygiene behavior.
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