Kidney disease is not just a problem affecting the urinary system. It can also have a significant impact on heart health. While many people focus on controlling kidney problems through medication and dietary changes, they may overlook the close relationship between the kidneys and the heart.

The kidneys help remove waste products and excess fluid from the blood, while the heart pumps blood throughout the body. When either organ does not function properly, the other can also be affected. Understanding this connection is essential for preventing complications and maintaining overall health.

Dr. Saket Garg, Senior Consultant in Cardiac Surgery at Metro Group of Hospitals, explains that kidney disease can increase the risk of cardiovascular complications, making regular health monitoring particularly important.

1. Kidney Problems Can Increase Blood Pressure

One of the major ways kidney disease affects the heart is through high blood pressure.

Healthy kidneys regulate the body's fluid balance and help maintain blood pressure. When kidney function declines, the body may retain excess salt and water, increasing the volume of blood circulating through the blood vessels.

This can raise blood pressure and force the heart to work harder to pump blood. Over time, uncontrolled hypertension can damage blood vessels and increase the risk of heart disease, heart failure, and stroke.

High blood pressure can also damage the kidneys further, creating a cycle in which kidney and cardiovascular problems worsen each other.

2. Excess Fluid Can Put Additional Strain on the Heart

When the kidneys cannot remove excess fluid effectively, water can accumulate in the body. This may cause swelling in the feet, ankles, or legs and, in severe cases, fluid can build up in the lungs.

The additional fluid places greater demands on the cardiovascular system. For people with advanced kidney disease or existing heart problems, this can contribute to heart failure or worsen its symptoms.

Sudden breathlessness, rapidly increasing swelling, or a significant increase in body weight over a short period should not be ignored. These symptoms require medical assessment, particularly in people with known kidney or heart disease.

3. Waste Products and Other Health Problems Can Affect the Heart

As kidney function declines, waste products and metabolic imbalances can accumulate in the body. These changes may contribute to inflammation, blood vessel dysfunction, and disturbances in minerals such as potassium and calcium.

Kidney disease can also occur alongside other conditions that increase cardiovascular risk, including diabetes, high blood pressure, and abnormal cholesterol levels.

Additionally, chronic kidney disease may cause anaemia, a condition in which the blood has a reduced capacity to carry oxygen. When this happens, the heart may need to work harder to supply oxygen to the body's tissues.

Together, these factors can increase the likelihood of cardiovascular complications.

4. Kidney Patients Should Monitor More Than Kidney Function

People living with kidney disease need a comprehensive approach to healthcare. Regular check-ups can help identify problems before they become severe.

Depending on the patient's condition, doctors may recommend monitoring:

• Blood pressure to identify and control hypertension.

• Blood glucose levels to manage diabetes.

• Cholesterol levels to assess cardiovascular risk.

• Kidney function through blood tests such as creatinine and estimated glomerular filtration rate (eGFR).

• Urine albumin levels to check for signs of kidney damage.

The frequency of these tests depends on the severity of kidney disease, other medical conditions, and the treatment plan.

5. Lifestyle Changes Can Help Protect Both Organs

Healthy daily habits can support kidney and heart health, although they cannot replace prescribed treatment.

Reduce excess salt: Limiting sodium intake can help control blood pressure and fluid retention. People with advanced kidney disease may need additional dietary adjustments.

Take medicines as prescribed: Do not stop or change medication without consulting your doctor. Some painkillers, particularly non-steroidal anti-inflammatory drugs (NSAIDs), can worsen kidney function in certain people.

Stay physically active: Regular, moderate exercise can support cardiovascular health. The appropriate level of activity depends on the person's overall condition.

Avoid smoking: Smoking damages blood vessels and increases the risk of cardiovascular disease.

Follow an individualised diet: People with kidney disease may need specific limits on sodium, potassium, phosphorus, protein, or fluids. These requirements vary, so consult a doctor or renal dietitian before making major dietary changes.

Why Early Treatment Matters

Kidney disease and heart disease can influence each other, but early detection and appropriate management can help reduce complications. Controlling blood pressure, managing diabetes, monitoring kidney function, and addressing cardiovascular risk factors are important parts of treatment.

People with kidney disease should seek urgent medical attention if they develop chest pain, severe breathlessness, fainting, or other sudden, serious symptoms.

The Bottom Line

Your kidneys and heart work together to keep your body functioning properly. When kidney function declines, changes in blood pressure, fluid balance, blood vessels, and blood chemistry can place additional stress on the heart.

Regular medical check-ups, appropriate medication, a personalised diet, and healthy lifestyle habits can help protect both organs. Taking kidney health seriously is also an important step towards reducing the risk of heart complications.