Reason for hypertension:

The biological conflict linked to the kidney collecting tubules originates at a time when life existed only in the ocean and being thrust out of the water environment created a life-threatening situation. This kind of distress also concerns human life because water is the primordial home of all living organisms. We humans experience the conflict of “feeling like a fish out of water” when we are unexpectedly “swept out” of our familiar surroundings or when we lose our “pack”.
Also abandonment conflict, existence conflict, or refugee conflict.

Symptoms of the conflict-active phase:

-- water retention
-- decreased urine output
-- elevated uric acid levels
-- elevated urea and creatinine levels

The body shifts to hypertension during the above mentioned active conflict phase, so that uric acid, urea and creatinine are still being flushed out of the body.

https://learninggnm.com/SBS/documents/kidneys.html