Abstract : Dengue fever remains a significant public health problem in Tomohon City. This study aims to identify factors that contribute to the increase of DHF cases in this area. The research method used was observational analytic with cross sectional design with accidental sampling technique with a total of 93 respondents and was a case study in Tomohon City. The results showed that knowledge, attitude, education and support from health workers were the main factors contributing to the increase in DHF cases in Tomohon City. The findings provide important implications for the development of more effective dengue prevention and control strategies.