What Should Seniors Know About Kidney Function and Kidney Disease?
Kidney function naturally declines with age, and chronic kidney disease affects a significant proportion of seniors. Understanding how kidneys work, why they matter, and how to protect them helps seniors maintain kidney health and manage kidney disease when it develops.
What Kidneys Do
Kidneys perform essential functions beyond simply making urine. They filter blood to remove waste products and excess fluid. They regulate electrolytes including sodium, potassium, and calcium. They produce hormones that control blood pressure, stimulate red blood cell production, and maintain bone health.
When kidneys fail, waste products accumulate, fluid balance is disrupted, and hormone production suffers. These changes affect virtually every body system, demonstrating how central kidney function is to overall health.
Age-Related Changes
Kidney function naturally declines with age even in healthy individuals. By age 80, kidney filtering capacity may be 60 to 70 percent of what it was at age 30. This normal decline makes seniors more vulnerable to additional kidney damage from disease, medications, or other insults.
Age-related decline usually does not cause symptoms or require treatment itself but reduces reserve capacity. The kidneys have less ability to compensate when stressed by illness, dehydration, or nephrotoxic medications.
Chronic Kidney Disease
Chronic kidney disease exists when kidney function is reduced below normal thresholds or when kidney damage is present. The condition is classified in stages based on how well kidneys filter, measured by glomerular filtration rate. Earlier stages may cause no symptoms while advanced stages cause significant health problems.
Diabetes and high blood pressure are the leading causes of chronic kidney disease. Other causes include glomerulonephritis, polycystic kidney disease, obstruction, recurrent infections, and medication damage. Multiple factors often contribute in individual patients.
Symptoms and Detection
Early kidney disease typically causes no symptoms. Many people have significant kidney function loss without knowing it. Symptoms that may develop as disease progresses include fatigue, weakness, difficulty concentrating, decreased appetite, sleep problems, muscle cramps, swelling in feet and ankles, changes in urination, and itchy skin.
Simple blood and urine tests detect kidney disease. Blood creatinine levels estimate filtration rate. Urine tests detect protein that leaks when kidneys are damaged. Regular testing is important for those at risk including diabetics, those with high blood pressure, and those with family history of kidney disease.
Protecting Kidney Health
Managing blood pressure and blood sugar protects kidneys from the damage these conditions cause. Target blood pressure below 130/80 and good diabetes control significantly slow kidney disease progression. Certain blood pressure medications provide extra kidney protection.
Avoiding nephrotoxic medications protects kidneys from additional damage. Nonsteroidal anti-inflammatory drugs like ibuprofen and naproxen can harm kidneys, especially when taken regularly. Always inform healthcare providers about kidney disease so appropriate medication choices are made.
Staying hydrated, not smoking, maintaining healthy weight, and limiting salt intake all support kidney health.
When Kidneys Fail
When kidneys can no longer maintain health, options include dialysis or kidney transplantation. Dialysis mechanically filters blood when kidneys cannot. Transplantation replaces failed kidneys with donor organs. For some elderly patients, conservative management focusing on comfort rather than life extension may be appropriate.
Getting Kidney Care
All Seniors Foundation can help connect seniors with kidney disease management resources. Protecting kidney health and managing kidney disease when present preserves quality of life. Contact us if you have concerns about kidney function or need support managing kidney disease.
