Chronic kidney disease can develop quietly for years before a person realizes anything is wrong.
This is especially important for older adults because kidney function naturally changes with age, while conditions such as diabetes and high blood pressure can speed up kidney damage.
The kidneys are two bean-shaped organs located toward the back of the abdomen. Although they are relatively small, they perform several jobs that are essential for keeping the body alive and healthy.
Every day, the kidneys continuously filter the blood. They remove waste products and extra water, which leave the body as urine, while keeping substances the body still needs.
The kidneys also help control blood pressure and keep minerals such as sodium and potassium in balance. They produce hormones involved in making red blood cells and maintaining healthy bones.
Chronic kidney disease, commonly called CKD, occurs when kidney damage or reduced kidney function continues for months or years. One of its biggest dangers is that early disease often causes no noticeable symptoms.
A person can lose a significant amount of kidney function and still feel reasonably well. For this reason, CKD is sometimes described as a silent disease, and blood and urine tests are often more useful than symptoms for finding it early.
Diabetes and high blood pressure are among the most important causes of chronic kidney disease. Over time, both conditions can damage the tiny blood vessels and filtering structures inside the kidneys.
Age also increases risk, but reduced kidney function should not automatically be dismissed as normal aging. Doctors consider a person’s test results, medical history and other evidence of kidney damage when deciding whether CKD is present.
When symptoms eventually appear, changes in urination may be noticed. A person might urinate more frequently, particularly at night, although urinary changes can also be caused by many other conditions.
Foamy urine can sometimes be a sign that protein is leaking into the urine because damaged kidney filters are no longer keeping it in the blood. Blood in the urine also needs medical assessment because it has several possible causes, including kidney and urinary tract problems.
Swelling can develop when damaged kidneys have difficulty managing salt and fluid. Extra fluid may collect in the feet, ankles, legs or other parts of the body.
Tiredness is another possible symptom. Healthy kidneys produce a hormone that tells the body to make red blood cells, and advanced kidney disease can reduce this signal and contribute to anemia.
With fewer healthy red blood cells carrying oxygen, people may feel weak, exhausted or short of breath. However, fatigue is extremely common and does not by itself mean that someone has kidney disease.
As kidney function becomes more severely reduced, waste products can accumulate in the blood. This may contribute to nausea, poor appetite, changes in taste, weight loss, itching and difficulty concentrating.
Sleep can also be affected in people with kidney disease. Some experience restless legs, itching or other problems that make it harder to get comfortable at night.
Many of these symptoms are more common in advanced CKD rather than early disease. Waiting for obvious warning signs is therefore not a reliable way to protect kidney health.
Testing is particularly important for people at increased risk. Doctors can use a blood test to estimate how effectively the kidneys are filtering blood and a urine test to look for abnormal amounts of protein.
These tests can identify problems before a person feels sick. Finding CKD early gives doctors more opportunity to treat its causes and slow further loss of kidney function.
Managing blood pressure and blood sugar is especially important. Depending on the patient, doctors may also prescribe medicines that protect the kidneys and reduce the risk of heart and blood vessel complications.
Healthy habits can support treatment as well. Avoiding smoking, staying physically active, maintaining a suitable weight and limiting excess sodium can help protect both kidney and heart health.
Dietary advice may change as kidney disease becomes more advanced, so people with CKD should not make major restrictions in protein, potassium or other nutrients without professional guidance. What is appropriate for one stage of kidney disease may not be appropriate for another.
Chronic kidney disease is widely documented in medical research and public health reports from organizations including the World Health Organization and major kidney health agencies. As populations grow older and diabetes and hypertension remain common, CKD is expected to continue placing a substantial burden on health systems.
The most important message is that kidney disease can be present without pain or obvious symptoms. People with diabetes, high blood pressure, heart disease, a family history of kidney problems or other risk factors can ask their healthcare professional whether regular kidney testing is appropriate.
Early diagnosis cannot always reverse existing kidney damage, but it can make a major difference. With monitoring, treatment and good control of underlying conditions, many people with CKD can slow its progression and protect their health for years.
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