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高血压的真实发病率不明，在发达国家其发病率要比不发达国家为高，从而成为一个重要的问题。世界上有少数国家和地区没有高血压病，其唯一的可能原因为饮食中的钠含量较低；而就我所知，中国膳食中的钠含量是不低的。原因不明的高血压常被称为特发性高血压（Essential Hypertension），而能查明其原因的则称为继发性高血压（Secondary Hyper-
The true incidence of hypertension is unknown, and its incidence in developed countries is much higher than in underdeveloped countries, making it an important issue. A few countries in the world have no hypertension and the only possible cause is low sodium in the diet; as far as I know, the sodium content in Chinese diet is not low. Hypertension of unknown origin is often referred to as Essential Hypertension, and the cause of what can be identified is Secondary Hyper-