BACKGROUNDHypertension, a silent killer is a major public health problem. Adult hypertension may start early in life. Literature shows an increasing trend in prevalence of hypertension among children. Early detection of prehypertensives will help in prevention of hypertension by adopting lifestyle modifications. As there is paucity in studies on prevalence of prehypertension among children of rural South Kerala, this study has been planned. Objectives-1. To study the prevalence of prehypertension among school children of age 9-17 years in Perumkadavila block, Thiruvananthapuram District. 2. To identify the risk factors of prehypertension in the study population.