High blood pressure in cats is now recognized as a condition that if left untreated can cause serious illness and death.
Hypertension typically occurs as a secondary disease to another illness like acute or chronic kidney failure and/or hyperthyroidism. In fact, hypertension occurs in over 60 percent of cats with renal failure and about 90 percent of hyperthyroid kitties.
Less frequently the condition has also been linked to over-production of the adrenal hormone aldosterone, as well as adrenal gland tumors.
There are also cases of idiopathic hypertension, which is high blood pressure with no discernible cause, as well as blood pressure elevation resulting from stressful situations like a trip to the vet.
Hypertension can result in damage to four major organ systems: the kidneys, the eyes, the nervous system and the cardiovascular system.