BACKGROUND: The incidence rate of hypertension is increasing in Indonesia concerning unhealthy behaviours such as unhealthy physical activity and eating pattern which trigger obesity. In Indonesia, the prevalence of hypertension in > 18-year-old people was 34.1% in 2018. AIM: The objective of the research was to find out the relationship between physical activity and obesity with the incidence of hypertension in adults (26-45 years old) in Medan. METHODS: The research was done in Medan, using a case-control study design. The samples were 150 hypertension patients, taken by using proportional allocation: 75 of them were in the case group and the other 75 of them were in the control group. The data were gathered by conducting interviews, measurement, and questionnaires and analysed by using simple logistic regression test. RESULTS: The result of the research showed that there was significant relationship of physical activity (p = 0.000; OR = 3.6; 95% CI, 1.802-7.270) and obesity (p = 0.000; OR = 4; 95% CI, 2.030-7.900) with the incidence of hypertension in 26-45-year-old respondents. CONCLUSION: Make a habit of a healthy lifestyle in their daily life by doing physical activity regularly and good eating pattern to forestall hypertension.