High blood pressure is divided into primary and secondary hypertension
secondary hypertension occurs in 10 % of patients and is due to other underlying diseases " kidney diseases, hormonal disorders
... " or medications , and is treated by treating the cause.
primary hypertension is said to be idiopathic
which means that it has no known cause , but many factors play a role in it including genetics
, diabetes ....
if you want more detailed information i advice you to have a look at the Health Information Center :
which can give you more detailed explanation with scientific terms and so on .