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 Indian adults have high blood pressure. More than 1 in 7 Indian adults may have chronic kidney disease (CKD). High blood pressure is the second leading cause of kidney failure in the Indian after diabetes.

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.
• Have family members with high blood pressure. 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.
• Are male. Men are more likely to develop high blood pressure before age 55; women are more likely to develop it after age 55.

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 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 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.

Prevention

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.

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.
• 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.
• 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

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 doctor about programs and products to help you quit smoking.

Stress

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 NIH external link or tai chi NIH external link
• Listening to music
• Focusing on something calm or peaceful

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.