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To assess the prevalence of hypertension and pre-hypertension among apparently healthy school going adolescents of Patna district, Bihar, India.A cross-sectional study among 2913 school going adolescents of 8–10th standard was conducted in Patna district of Bihar from April 2014 to August 2015 by adopting a two stage cluster sampling technique. Blood pressure, height and weight were measured by using standard procedure. The questions pertaining to risk behaviour in relation to cardiovascular diseases were taken from WHO's Global School based Student Health Survey (GSHS). Mean, 95% confidence interval (C.I.), chi-square test, ANOVA and correlation coefficient were used for statistical analysis.The mean systolic and diastolic blood pressure of study population was 107.4 (95% C.I. 106.93–107.77) and 67.4 (95% C.I. 67.26–67.54) respectively. Prevalence of pre-hypertension and hypertension was 10.9% and 4.6% in school going adolescents while prevalence of overweight/Obesity was 1.5%. Both systolic and diastolic blood pressures had positive and significant correlation with age, height and body mass index. The proportion of children who had ever taken tobacco was 5.3%, cigarette smoking 4.3%, alcohol consumption 2.1%, and excess salt intake 22.3%. Only 49.1% children were doing physical activity at least one hour a day in past seven days for maintenance of good health. Nearly 35.6% children had never taken fruits in last 7 days while 20.2% children had taken cold drink one or more time in past seven days. The proportion of children who had taken junk foods every day in past 7 days was 3.2%.The present study recommends that adolescents must be screened regularly for blood pressure so that remedial measure can be initiated as early as possible.