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BACKGROUND: Hypertension is the most common chronic disease and a major modifiable risk factor for cardio-cerebrovascular and renal diseases. This study estimated the national burden of hypertension, defined as systolic blood pressure ≥140 mm Hg, on morbidity and mortality in 2021 in France. METHODS: For all diseases causally associated with hypertension (cardiovascular diseases, chronic kidney diseases, and dementia), the number and proportion of cases attributable to hypertension in adults aged ≥35 years were estimated using population attributable fractions. Age- and sex-specific population attributable fractions were computed using the distribution of hypertension in the French population. These population attributable fractions were applied to nationwide statistics for mortality, hospitalizations, disease prevalence, years of life lost, years of life lived with disability, and disability-adjusted years of life. RESULTS: The largest population attributable fractions were for ischemic heart disease and hemorrhagic stroke, with over 40% of cases attributable to hypertension. Overall, more than 385 000 patients were hospitalized due to hypertension, with 3.7 million hospitalizations and 6.2 million hospital days (all hospitalizations, including 3.4 million for chronic kidney disease) and including 390 000 overnight hospitalization. In 2021, more than 1.15 million individuals lived with ischemic heart disease attributable to hypertension, 1.26 million with chronic kidney diseases, and 358 033 with heart failure. Among 184 059 annual deaths from cardiovascular diseases, dementia, and chronic kidney diseases, 30% (55 280 deaths) were attributable to hypertension. Hypertension accounted for 8.5% of all deaths and 498 052 years of life lost. CONCLUSIONS: In France, despite near-universal health coverage and free health care access, the burden attributable to hypertension remains high. [ABSTRACT FROM AUTHOR]