How does a disorder of the kidneys lead to hypertension?

Excess Hormones: In certain rare situations, a gland on the kidney can secrete a hormone that persistently elevates blood pressure. Additionally, the renal arteries can narrow and also lead to an elevated blood pressure.

Blood pressure : Hormones are secreted which raise the blood pressure. Often patient disease started with some essential hypertension and progresses, salt is retained. Multiple factors.