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High blood pressure can affect your body in several ways. Blood pressure can be elevated when your body increases its volume of blood, when your heart pumps more blood through your arteries and when your arteries are constricted. When it comes to primary high blood pressure the cause of these changes is unclear, but for secondary high blood pressure they may be the result of a kidney disorder, hormonal disorder or a tumor in an adrenal gland. Regardless, they are all partly regulated by your kidneys and it is common for kidneys to get damaged as a result of high blood pressure. The same can be said for your heart and your arteries. The harder they have to work the thicker they get and that's not a good thing. Left untreated, secondary high blood pressure could lead to an aneurysm, stroke or heart attack.