High blood pressure usually results from kidney disease or a hyperactive thyroid gland.

By Tom Ewing

Cats, just like human beings, begin to experience noticeable physical changes as they transition into and beyond middle age. These changes may become evident as early as age eight or nine (the physiologic equivalent of the late 40s or early 50s in human years). And in a cat that has reached the ripe old age of 15 or so — as in people who have reached their seventies — these changes may well take the form of significant challenges to its health. …

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