High blood pressure, also known as hypertension, is often called a silent condition because many people can have it without noticeable symptoms. While much of the attention around hypertension focuses on the heart and risk of stroke, uncontrolled high blood pressure can also cause serious damage to the kidneys.
Your kidneys play an important role in filtering waste and excess fluid from your blood. When high blood pressure damages the blood vessels and filtering structures within the kidneys, their ability to function properly can gradually decline.
How Does High Blood Pressure Affect the Kidneys?
Your kidneys contain a network of tiny blood vessels that help filter your blood. Persistently high blood pressure places additional stress on these vessels. Over time, the blood vessels can become narrowed and damaged, reducing the kidneys’ ability to filter waste and excess fluid effectively.
As kidney function declines, excess salt and fluid can build up in the body. This can cause blood pressure to rise further, creating a cycle in which high blood pressure causes kidney damage, and damaged kidneys make blood pressure harder to control.
High blood pressure and diabetes are among the most common causes of chronic kidney disease in adults.
Why Kidney Damage Can Go Unnoticed
One of the challenges with kidney disease is that it may develop without obvious symptoms in its early stages. A person can have high blood pressure and early kidney damage without feeling unwell.
This means waiting for symptoms before checking your kidney health may allow the condition to progress. When kidney disease becomes more advanced, symptoms may include:
- Swelling in the feet, ankles, legs, hands, or face
- Changes in urination
- Persistent tiredness
- Loss of appetite
- Nausea or vomiting
- Difficulty concentrating
- Muscle cramps
- Itching or dry skin
- Shortness of breath
These symptoms can have several possible causes, so they should be assessed by a healthcare professional rather than assumed to be kidney disease.
How Can You Know if High Blood Pressure Is Affecting Your Kidneys?
Regular monitoring is important, particularly if you have been diagnosed with hypertension.
Healthcare professionals may assess kidney health using:
- Blood pressure checks: Regular monitoring helps determine whether your blood pressure is being adequately controlled.
- Blood tests: A blood test can be used to assess kidney filtration, including the estimated glomerular filtration rate (eGFR).
- Urine tests: Testing urine for albumin, a type of protein, can help identify possible kidney damage.
Your doctor may recommend these tests based on your blood pressure, medical history, other health conditions, and risk factors.
Who Should Be More Concerned About Kidney Health?
People with high blood pressure should take kidney health seriously, particularly when other risk factors are present.
Your risk may be higher if you also have:
- Diabetes
- Heart disease
- A family history of kidney disease or kidney failure
- Long-standing or poorly controlled hypertension
Early testing can help identify kidney problems before significant loss of function occurs.
How Can You Protect Your Kidneys?
Managing your blood pressure is one of the most important steps you can take to protect your kidneys. Depending on your individual health needs, your healthcare professional may recommend:
- Taking prescribed medication: If you have been prescribed medication for hypertension, take it as directed and discuss any side effects or concerns with your doctor.
- Reducing excess salt: A healthy, lower-sodium eating pattern can support blood pressure management.
- Staying physically active: Regular physical activity can support healthy blood pressure and overall health.
- Maintaining a healthy weight: Weight management can help with blood pressure control.
- Avoiding smoking: Smoking can damage blood vessels and increase cardiovascular risk.
- Managing diabetes: If you have diabetes, keeping your blood glucose within your recommended range can help protect your kidneys.
- Attending regular check-ups: Consistent monitoring makes it easier to identify changes in blood pressure or kidney function early.
Protect Your Blood Pressure. Protect Your Kidneys.
High blood pressure does not have to result in kidney disease. Early detection, consistent treatment, and appropriate lifestyle changes can help reduce the risk of kidney damage and slow the progression of kidney disease when it is already present. If you have high blood pressure, do not wait for symptoms before discussing your kidney health with a healthcare professional. Ask about the appropriate blood and urine tests for your situation.
At Lagos Executive Cardiovascular Centre (LECC), our specialists provide comprehensive care for cardiovascular and related health conditions, including the management of hypertension and its potential complications. Book an appointment with LECC to have your blood pressure and overall health assessed.