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It is rather easy to treat blood pressure, but it is very very difficult to find out the cause of it, in a given individual. Usually only some common treatable conditions are looked for.
Doing the same tests more than once may not help.
There are a variety of sophisticated investigations – several hormones, several scans and so on...
They are costly and cumbersome...
Yet, the chances of arriving at the cause in a given individual is very poor.
If you are particular, you ought to see a nephrologist
/ cardiologist team in a multi-speciality tertiary care centre.
Wishing speedy recovery