Remaja di sman 1 malinau dari 10 siswi, terdapat 8 remaja yang mengalami stres akibat banyak kesibukan dan tugas-tugas yang diperoleh. remaja yang mengalami stres ini ternyata diantaranya 5 orang mengalami perubahan siklus menstruasi, ada yang siklus 35 hari. menstruasi adalah perdarahan periodik wanita akibat luruhnya lapisan endometrium rahim yang tidak terbuahi, menstruasi normal 21–35 hari. stres adalah respon fisik dan psikologis terhadap tuntutan yang menimbulkan ketegangan dan mengganggu keseimbangan aktivitas sehari-hari. kondisi stres membuat hpa (hypothalamic pituitary adrenal) meningkat, menyebabkan hipotalamus mengeluarkan crh(corticotropic releasing hormone). penelitian ini bertujuan untuk mengetahui tingkat stres, siklus menstruasi dan hubungan tingkat stres dengan siklus menstruasi. desain penelitian menggunakan desain pendekatan cross sectional. instrumen yang digunakan dalam penelitian ini yaitu kuesioner tingkat stres pss 10 dan kuesioner menstruasi. hasil penelitian di dapatkan rata- rata , siklus menstruasi normal yaitu 21-35 hari 60.5% siklus pendek 23.4%, siklus panjang 16.1%, dan tingkat stres yang paling banyak yaitu stres sedang 64,5%, stres berat 25,0% dan stres ringan 10,5% dan tidak ada hubungan antara tingkat stres dan siklus menstruasi ( p= 0. 326 > 0.05). kata kunci: siklus menstruasi, tingkat stres, remaja

Adolescents at sman 1 malinau out of 10 female students, there were 8 adolescents who experienced stress due to many busy activities and tasks. among these stressed adolescents, 5 of them experienced changes in their menstrual cycle, some cycles were 35 days. menstruation is periodic female bleeding due to the shedding of the unfertilized endometrial layer of the uterus, normal menstruation is 21-35 days. stress is a physical and psychological response to demands that create tension and disrupt the balance of daily activities. stressful conditions make the hpa (hypothalamic pituitary adrenal) increase, causing the hypothalamus to release cri-i (corticotropic releasing hormone). this study aimed to determine the level of stress, menstrual cycle and the relationship between stress level and menstrual cycle. the research design used a cross sectional approach design. the instruments used in this study were pss 10 stress level questionnaire and menstrual questionnaire. the results of the study obtained the average, normal menstrual cycle ranging 21-35 days was 60.5%, 23.4% short cycle, 16.1% long cycle, and the most stress level was moderate stress 64.5%, followed by severe stress 25.0% and mild stress 10.5% and there was no relationship between stress levels and menstrual cycles (p= 0. 326 > 0.05). keywords: menstrual cycle, stress level, adolescents