Another cause of obstruction in the blood vessels is overgrowth of the muscle in the wall of the artery, which is called fibromuscular dysplasia. The arteries to the kidneys are most vulnerable. Renal (kidney) arteries can also develop atherosclerotic blockages.Regardless of cause, when blood flow is diminished to the kidneys, your blood pressure tends to increase. Here’s why: when your kidneys get inadequate blood flow they react as though blood pressure were low all over the body. This response triggers the kidneys to release hormone “messengers” that increase blood pressure. This process is similar to blowing cold air on a thermostat: the thermostat responds by increasing the heat in the whole house. Artery blockage in the kidneys can also lead to a decrease in their ability to eliminate waste products.*202\252\8*

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