How Diabetes and Hypertension Are Related

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Diabetes and high blood pressure are closely related diseases. They occur together so frequently that they are officially considered to be “comorbidities” (diseases likely to be present in the same patient). Unfortunately, diabetes makes high blood pressure more difficult to treat, and high blood pressure makes diabetes even more dangerous.

Can Diabetes and Hypertension Occur Together?

Diabetes and high blood pressure tend to occur together because they share certain physiological traits — that is, the effects caused by each disease tend to make the other disease more likely to occur. In the case of diabetes and high blood pressure, these effects include:

  • Increased Fluid Volume: Diabetes increases the total amount of fluid in the body, which tends to raise blood pressure.
  • Increased Arterial Stiffness: Diabetes can decrease the ability of the blood vessels to stretch, increasing average blood pressure.
  • Impaired Insulin Handling: Changes in the way the body produces and handles insulin can directly cause increases in blood pressure.

Although these common biological traits partially explain why diabetes and high blood pressure are such a common pair, in many cases, the two diseases are likely to occur together simply because they share a common set of risk factors. Some important shared risk factors are:

  • Body Mass: Being overweight significantly increases the risk of both diabetes and high blood pressure.
  • Diet: High-fat diets rich in salt and processed sugars are known to contribute to the development of organ problems that can lead to both diabetes and high blood pressure.
  • Activity Level: A low level of physical activity makes insulin less effective (which can lead to diabetes) and can contribute to the development of stiff blood vessels, increasing the risk of high blood pressure.

Preventive strategies for both high blood pressure and diabetes usually focus on these specific risk factors.

How Common is Hypertension in People with Diabetes?

Data from one large, widely referenced study on type 1 diabetes showed:

  • 5 percent of patients have high blood pressure within 10 years
  • 3 percent have high blood pressure within 20 years
  • 70 percent have high blood pressure by age 40

In studies of type 2 diabetes, data has shown that almost 75 percent of patients with kidney problems (a common complication) had high blood pressure. In those with type 2 diabetes but no kidney problems, the rate of high blood pressure was about 40 percent. Overall, when averaged across diabetes type and age range, about 35 percent of all people with diabetes have high blood pressure.

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Article Sources

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial policy to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  • Sowers, JR, Epstein, M, Frohlich, ED. Diabetes, hypertension, and cardiovascular disease: an update. Hypertension 2001; 37:1053.