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How can I protect my kidneys from high blood pressure?

How can I prevent or slow the progression of kidney disease from high blood pressure? being physically active. maintaining a healthy weight. quitting smoking. managing stress. following a healthy diet, including less sodium (salt) intake.

niddk.nih.gov - High Blood Pressure & Kidney Disease | NIDDK
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What is high blood pressure?

Blood pressure is the force of blood pushing against blood vessel walls as your heart pumps out blood. High blood pressure, also called hypertension, is an increase in the amount of force that blood places on blood vessels as it moves through the body.

What are the kidneys and what do they do?

Healthy kidneys filter about a half cup of blood every minute, removing wastes and extra water to make urine. The urine flows from each kidney to the bladder through a pair of thin tubes called ureters, one on each side of your bladder. Your bladder stores urine. Your kidneys, ureters, and bladder are part of your urinary tract system.

How does high blood pressure affect the kidneys

High blood pressure can constrict and narrow the blood vessels, which eventually damages and weakens them throughout the body, including in the kidneys. The narrowing reduces blood flow. If your kidneys’ blood vessels are damaged, they may no longer work properly. When this happens, the kidneys are not able to remove all wastes and extra fluid from your body. Extra fluid in the blood vessels can raise your blood pressure even more, creating a dangerous cycle, and cause more damage leading to kidney failure.

How common are high blood pressure and kidney disease?

Almost 1 in 2 U.S. adults—or about 108 million people—have high blood pressure.1 More than 1 in 7 U.S. adults—or about 37 million people—may have chronic kidney disease (CKD).2 High blood pressure is the second leading cause of kidney failure in the United States after diabetes, as illustrated in Figure 1.2 Almost 1 in 2 U.S. adults—or about 108 million people—have high blood pressure. View full-sized image Figure 1. Causes of kidney failure in the United States2

Who is more likely to have high blood pressure or kidney disease?

High blood pressure

You are more likely to have high blood pressure if you

are older. Blood pressures tends to increase with age. Our blood vessels naturally thicken and stiffen over time. Blood pressures tends to increase with age. Our blood vessels naturally thicken and stiffen over time. have family members with high blood pressure. High blood pressure tends to run in families. High blood pressure tends to run in families. have unhealthy lifestyle habits. Unhealthy habits such as eating too much sodium (salt), drinking too many alcoholic beverages, or not being physically active can increase your risk of high blood pressure. Unhealthy habits such as eating too much sodium (salt), drinking too many alcoholic beverages, or not being physically active can increase your risk of high blood pressure. are African American. High blood pressure is more common in African American adults than in Caucasian, Hispanic, or Asian adults. High blood pressure is more common in African American adults than in Caucasian, Hispanic, or Asian adults. are male. Men are more likely to develop high blood pressure before age 55; women are more likely to develop it after age 55.

Kidney disease

In addition to high blood pressure, other factors that increase your risk of kidney disease are

diabetes

a family history of kidney failure

race or ethnicity—African Americans, Hispanics, and American Indians tend to have a greater risk for CKD High blood pressure can be both a cause and a result of kidney disease.

What are the symptoms of high blood pressure and kidney disease?

Most people with high blood pressure do not have symptoms. In rare cases, high blood pressure can cause headaches. Early CKD also may not have symptoms. As kidney disease gets worse, some people may have swelling, called edema. Edema happens when the kidneys cannot get rid of extra fluid and salt. Edema can occur in the legs, feet, ankles, or—less often—in the hands or face.

Symptoms of advanced kidney disease can include

loss of appetite, nausea, or vomiting

drowsiness, feeling tired, or sleep problems

headaches or trouble concentrating

increased or decreased urination

generalized itching or numbness, dry skin, or darkened skin

weight loss

muscle cramps

chest pain or shortness of breath

How do health care professionals diagnose high blood pressure and kidney disease?

High blood pressure

Blood pressure test results are written with the two numbers separated by a slash. The top number is called the systolic pressure and represents the pressure as the heart beats and pushes blood through the blood vessels. The bottom number is called the diastolic pressure and represents the pressure as blood vessels relax between heartbeats. Your health care professional will diagnose you with high blood pressure if your blood pressure readings are consistently higher than 130/80 when tested repeatedly in a health care office.

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Health care professionals measure blood pressure with a blood pressure cuff. You can also buy a blood pressure cuff to monitor your blood pressure at home.

Health care professionals measure blood pressure with a blood pressure cuff.

Kidney disease

To check for kidney disease, health care professionals use

a blood test that checks how well your kidneys are filtering your blood, called GFR, which stands for glomerular filtration rate. a urine test to check for albumin. Albumin is a protein that can pass into the urine when the kidneys are damaged. If you have kidney disease, your health care professional will use the same two tests to monitor your kidney disease.

How can I prevent or slow the progression of kidney disease from high blood pressure?

The best way to slow or prevent kidney disease from high blood pressure is to take steps to lower your blood pressure. These steps include a combination of medicines and lifestyle changes, such as

being physically active

maintaining a healthy weight

quitting smoking

managing stress

following a healthy diet, including less sodium (salt) intake

No matter what the cause of your kidney disease, high blood pressure can make your kidneys worse. If you have kidney disease, you should talk with your health care professional about your individual blood pressure goals and how often you should have your blood pressure checked.

Medicines

Medicines that lower blood pressure can also significantly slow the progression of kidney disease. Two types of blood pressure-lowering medications, angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs), may be effective in slowing the progression of kidney disease. Many people require two or more medications to control their blood pressure. In addition to an ACE inhibitor or an ARB, a health care professional may prescribe a diuretic—a medication that helps the kidneys remove fluid from the blood—or other blood pressure medications.

Physical activity

Regular physical activity can lower your blood pressure and reduce your chances of other health problems. Aim for at least 150 minutes per week of moderate-intensity aerobic activity. These activities make your heart beat faster and may cause you to breathe harder. Start by trying to be active for at least 10 minutes at a time without breaks. You can count each 10-minute segment of activity toward your physical activity goal. Aerobic activities include

biking (Don’t forget the helmet.)

swimming

brisk walking

wheeling yourself in a wheelchair or engaging in activities that will support you such as chair aerobics Biking is one type of moderate-intensity exercise that can help lower your blood pressure and weight. If you have concerns, a health care professional can provide information about how much and what kinds of activity are safe for you.

Body weight

If you are overweight or have obesity, aim to reduce your weight by 7 to 10 percent during the first year of treatment for high blood pressure. This amount of weight loss can lower your chance of developing health problems related to high blood pressure. Body Mass Index (BMI) is the tool most commonly used to estimate and screen for overweight and obesity in adults. BMI is a measure based on your weight in relation to your height. Your BMI can tell if you are at a normal or healthy weight, are overweight, or have obesity. Normal or healthy weight. A person with a BMI of 18.5 to 24.9 is in the normal or healthy range. A person with a BMI of 18.5 to 24.9 is in the normal or healthy range. Overweight. A person with a BMI of 25 to 29.9 is considered overweight. A person with a BMI of 25 to 29.9 is considered overweight. Obesity. A person with a BMI of 30 to 39.9 is considered to have obesity. A person with a BMI of 30 to 39.9 is considered to have obesity. Severe obesity. A person with a BMI of 40 or greater is considered to have severe obesity. Your goal should be a BMI lower than 25 to help keep your blood pressure under control.3

Smoking

If you smoke, you should quit. Smoking can damage blood vessels, raise the chance of developing high blood pressure, and worsen health problems related to high blood pressure. If you have high blood pressure, talk with your health care professional about programs and products to help you quit smoking.

Stress

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Learning how to manage stress, relax, and cope with problems can improve your emotional and physical health. Some activities that may help you reduce stress include

being physically active

practicing yoga or tai chi

listening to music

focusing on something calm or peaceful

meditating

Physical activity can reduce stress and lower blood pressure.

How does eating, diet, and nutrition affect high blood pressure and kidney disease?

Following a healthy eating plan can help lower your blood pressure. Reducing the amount of sodium in your diet is an important part of any healthy eating plan. Your health care professional may recommend the Dietary Approaches to Stop Hypertension (DASH) eating plan. DASH focuses on fruits, vegetables, whole grains, and other foods that are healthy for your heart and lower in sodium, which often comes from salt. The DASH eating plan

is low in fat and cholesterol

features fat-free or low-fat milk and dairy products, fish, poultry, and nuts

suggests less red meat, sweets, added sugars, and sugar-containing beverages

is rich in nutrients, protein, and fiber

A healthy eating plan includes a variety of healthy, nutritious foods.

A registered dietitian can help tailor your diet to your kidney disease. If you have congestive heart failure or edema, a diet low in sodium intake can help reduce edema and lower blood pressure. Reducing saturated fat and cholesterol can help control high levels of lipids, or fats, in the blood. People with advanced kidney disease should speak with their health care professional about their diet.

What should I avoid eating if I have high blood pressure or kidney disease?

If you have kidney disease, avoid foods and beverages that are high in sodium. Additional steps you can take to meet your blood pressure goals may include eating heart-healthy and low-sodium meals, quitting smoking, being active, getting enough sleep, and taking your medicines as prescribed. You should also limit alcoholic drinks—no more than two per day for men and one per day for women—because consuming too many alcoholic beverages raises blood pressure. In addition, a health care professional may recommend that you eat moderate or reduced amounts of protein. Proteins break down into waste products that the kidneys filter from the blood. Eating more protein than your body needs may burden your kidneys and cause kidney function to decline faster. However, eating too little protein may lead to malnutrition, a condition that occurs when the body does not get enough nutrients. If you have kidney disease and are on a restricted protein diet, a health care professional will use blood tests to monitor your nutrient levels.

Clinical Trials for Kidney Disease

The NIDDK conducts and supports clinical trials in many diseases and conditions, including kidney diseases. The trials look to find new ways to prevent, detect, or treat disease and improve quality of life.

What are clinical trials for high blood pressure and kidney disease?

Clinical trials—and other types of clinical studies—are part of medical research and involve people like you. When you volunteer to take part in a clinical study, you help doctors and researchers learn more about disease and improve health care for people in the future. Researchers are studying many aspects of high blood pressure and kidney disease, such as managing high blood pressure through diet, education, and counseling in patients with kidney disease

testing new medications to treat high blood pressure and kidney disease

Find out if clinical studies are right for you.

What clinical studies for high blood pressure and kidney disease are looking for participants?

You can view a filtered list of clinical studies on high blood pressure and kidney disease that are federally funded, open, and recruiting at www.ClinicalTrials.gov. You can expand or narrow the list to include clinical studies from industry, universities, and individuals; however, the National Institutes of Health does not review these studies and cannot ensure they are safe. Always talk with your health care professional before you participate in a clinical study.

What have we learned about high blood pressure and kidney disease from NIDDK-funded research?

The NIDDK has supported many research projects to learn more about the effects of high blood pressure on kidney disease including identifying genes related to a cholesterol protein that causes African Americans to be at higher risk for kidney disease.

References

niddk.nih.gov - High Blood Pressure & Kidney Disease | NIDDK
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