Kidney disease in the elderly — the stages and what each means

Reviewed by the How To Help Your Elders Medical Advisory Process

Chronic kidney disease is common in older adults and usually develops silently over years, driven by diabetes, high blood pressure, or long-term medication use. By the time symptoms appear, significant damage has already occurred. Understanding the stages, the treatment options, and the dialysis decision gives families the knowledge to support their parent through choices that will shape the rest of their life.

Kidney Disease Is Usually Advanced Before Symptoms Appear

Your parent seems fine. A little tired maybe, but they're in their seventies or eighties, and everyone's tired. Then during a routine doctor's visit, the doctor mentions something about kidney function being "a little low." Kidney function. It's such a clinical term that you almost don't register it means one of their organs is failing. And the worst part is they probably won't feel much of anything until it's very advanced. Your parent might lose significant kidney function and still feel normal.

This is the cruelty of kidney disease in older adults. It's silent. It whispers at first, mostly through lab values that your parent sees but might not understand. If they do understand, the numbers don't feel urgent because they feel fine. By the time they start noticing symptoms, they're often not fine anymore. The disease has been quietly eroding kidney function for months or years, and now there's a decision to make that will shape the rest of their life.

The National Kidney Foundation estimates that 37 million American adults have chronic kidney disease (CKD), and approximately 90% of them don't know it. According to the CDC, CKD is more common in adults over 65, with prevalence rates approaching 38% in that age group based on estimated glomerular filtration rate (eGFR) criteria. The NIH's National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) reports that diabetes and high blood pressure together account for approximately two-thirds of CKD cases.

Kidney disease in aging parents often comes with guilt, both yours and theirs. They might feel like they should have seen this coming, should have taken better care of themselves. You might feel like you should have been paying more attention to their lab work. But the truth is that kidney disease develops slowly, in response to things that have been accumulating over a lifetime. And it doesn't announce itself.

The kidney's job is more important than most people understand. It's not just about making urine. The kidneys filter waste from the blood, regulate blood pressure, control the balance of electrolytes and water, and produce hormones that help create red blood cells and regulate bone health. When the kidneys start to fail, all of those jobs start falling apart.

The Silent Decline: How Kidney Disease Progresses

Kidney disease in older adults usually doesn't announce itself with pain or urgency. Instead, it announces itself through lab work, and even then, only if the right tests are being done. Your parent's kidneys could be functioning at sixty percent of normal and they would feel completely fine. At forty percent, still fine for many people. At thirty percent, maybe they're a little more tired than they used to be. At twenty percent, now something is starting to noticeably change.

CKD is classified in five stages based on eGFR, measured in mL/min/1.73m2. Stage 1 (eGFR 90 or above with evidence of kidney damage) and Stage 2 (eGFR 60 to 89) usually produce no symptoms. Stage 3 (eGFR 30 to 59) is where most people are first diagnosed, often incidentally during routine blood work. Stage 4 (eGFR 15 to 29) brings more noticeable symptoms. Stage 5 (eGFR below 15) is kidney failure, where dialysis or transplant becomes a consideration.

The disease usually develops because something else has been damaging the kidneys for years. Diabetes is the most common cause, accounting for about 38% of kidney disease cases according to the NIDDK. High blood pressure is the second most common, accounting for about 26%. Both of these conditions damage the delicate filtering structures in the kidney over time. Some older adults develop kidney disease from long-term use of certain medications, particularly nonsteroidal anti-inflammatory drugs like ibuprofen, and some blood pressure medications. Some develop it from chronic infections or autoimmune diseases. But very often, by the time kidney disease is diagnosed, your parent can't point to a single cause.

The decline is slow until it isn't. Your parent might have the same kidney function number at their last two doctor visits, the one before that, the one before that. Then suddenly the numbers start dropping faster. What was stable for two years becomes unstable in six months. This is the nature of progressive kidney disease. It's often predictable in direction but less predictable in speed. And speed changes the timeline for decisions.

What You'll Notice: When Kidney Disease Starts to Show

The early signs of kidney disease are subtle. Your parent might be more tired than usual. Fatigue is one of the most common early symptoms because the kidneys produce erythropoietin, a hormone that signals the body to make red blood cells. When kidney function declines, there are fewer red blood cells, and your parent becomes anemic. Fewer red blood cells mean less oxygen being delivered to tissues, which causes fatigue. It might seem like normal aging, but if it's worse than usual, it's worth mentioning to their doctor.

You might notice swelling. Your parent's ankles or feet might puff up, especially after standing for a while. Their face might look puffy, particularly in the morning. This swelling, called edema, happens because the kidneys are not excreting the right amount of sodium and water.

Changes in urination patterns should be noted. Your parent might have to urinate more frequently, especially at night (nocturia). They might produce more urine or less urine, depending on how far the disease has progressed. They might notice that their urine is darker or foamy, which can indicate protein in the urine.

Appetite changes are common. Your parent might not feel hungry, or they might have a metallic taste in their mouth that makes food unappetizing. This happens because kidney disease causes a buildup of waste products in the bloodstream.

Confusion or cognitive changes should be taken seriously. Kidney disease can cause a buildup of toxins that affect brain function. Your parent might seem foggy, might have trouble concentrating. This is sometimes mistaken for early dementia, but it might be kidney-related.

Nausea, vomiting, high blood pressure that gets worse, and difficulty catching their breath are all signs that kidney disease is progressing. Difficulty breathing or chest pain needs immediate attention, as kidney disease can cause fluid to accumulate in the lungs.

Treatment: Trying to Slow the Decline

In the early stages of kidney disease, the goal is to slow the decline. This is done primarily through management of the underlying conditions and through medication. If your parent has diabetes, better control of their blood sugar helps. If they have high blood pressure, keeping it well-controlled is important. ACE inhibitors or ARBs are commonly prescribed because they specifically reduce the pressure in the kidneys' blood vessels.

The American Diabetes Association and the National Kidney Foundation both emphasize that controlling blood sugar (A1C below 7% for most patients) and blood pressure (below 130/80 for most CKD patients) are the two most effective interventions for slowing CKD progression. Newer medications, including SGLT2 inhibitors, have shown significant kidney-protective benefits and are now recommended by the KDIGO (Kidney Disease: Improving Global Outcomes) guidelines for patients with CKD regardless of diabetes status.

Diet becomes important as kidney disease progresses. A kidney-friendly diet usually means limiting sodium to reduce fluid retention and blood pressure. It might mean limiting protein, because the kidneys have to work to process protein and damaged kidneys work less efficiently. It might mean limiting phosphorus and potassium if their blood levels of these minerals are getting too high. This diet is not easy to follow. It means cooking differently, giving up foods your parent loves, and making constant adjustments.

Medications for managing the consequences of kidney disease are common. Your parent might take diuretics to manage swelling, blood pressure medications, medications to control phosphorus or potassium levels, and medications to help with anemia. As kidney function declines, the number of medications often increases, and managing them becomes more complicated.

Regular monitoring is essential. Your parent will need blood tests to check kidney function, electrolyte levels, and other markers. The doctor should be checking eGFR, which estimates how much of the kidney's filtering capacity remains.

The Dialysis Question: When Kidneys Fail Almost Completely

As kidney disease progresses, a point comes where the kidneys are no longer able to filter waste adequately. When this happens, dialysis becomes a real option. The question of whether to start dialysis is not a simple medical question. It's also a question about quality of life, about goals, about what matters most.

Dialysis is not a cure. It's a treatment that replaces one of the kidney's functions (waste filtration) but not all of them. According to the United States Renal Data System (USRDS), approximately 574,000 Americans were receiving dialysis as of the most recent annual report. The median age of new dialysis patients is around 65.

There are two main types. Hemodialysis involves having blood filtered through a machine outside the body. This usually happens three times a week for three to four hours at a dialysis center. Some older adults do hemodialysis at home, which gives more flexibility. Peritoneal dialysis involves implanting a catheter in the abdomen and using the peritoneal membrane as a filter. A special fluid is run into the abdomen, sits there for several hours, then is drained out, taking waste with it. This can be done overnight using a machine, or several times a day by hand.

Both types of dialysis extend life. But dialysis changes a person's life significantly. Three days a week connected to a machine, dietary restrictions, fluid restrictions, medical appointments that can't be moved, complications including infections, clotting, and difficulties with the access point. This becomes your parent's reality.

For some older adults, dialysis is clearly the right choice. They have years of life ahead, they're healthy enough to tolerate it, and they want every opportunity to continue living. For others, dialysis doesn't feel like the right fit. They might be very frail, have advanced dementia, or feel that the time on dialysis interferes too much with what makes their life meaningful. They might choose conservative management instead, treating the disease with medications and diet and accepting that their kidneys will eventually fail. Conservative management is a valid choice, though it's not always clearly presented as one.

The conversation about dialysis should happen while your parent still has some kidney function, not in a crisis when decisions have to be made quickly. It should involve their nephrologist, their primary care doctor, you, and anyone else important to your parent's life. The question isn't just whether dialysis is medically possible, but whether it aligns with your parent's values and goals.

Living With the Disease: The Daily Adjustment

Whether your parent stays in the early stages or progresses to the point where dialysis is needed, kidney disease changes how they live. The diet becomes more restrictive and less forgiving. The medications multiply. The lab appointments happen regularly. The fatigue might be persistent. The restrictions on fluids, if their kidney disease is advanced, can be particularly hard. Your parent might be limited to a liter of fluid a day or less.

You become, partly, a diet monitor. You learn what foods are high in potassium and help your parent avoid them. You learn what foods are high in phosphorus. You learn that many processed foods are high in sodium. You shop differently, cook differently.

You become, partly, a medication organizer. If dialysis happens, you might be the one helping your parent keep track of which day dialysis is, making sure they get there, picking them up afterward when they're tired.

If your parent stays on conservative management and doesn't choose dialysis, you become the person who helps them adjust to progressive decline. Your parent will get more fatigued. Their cognitive function might deteriorate. Eventually, uremic toxins will accumulate, and the disease becomes more apparent and more debilitating.

The kidney disease patient often feels that they've lost control of their body. One of the most important things you can do is help restore some of that control where possible. Help your parent understand their numbers. Help them understand the choices they have. Listen to their preferences and values, not just what the doctor recommends. Sometimes the role of a family member is not to convince someone to do more treatment but to help them feel supported in whatever choices they make.

Frequently Asked Questions

How is chronic kidney disease diagnosed?
CKD is diagnosed through blood and urine tests. The key blood test measures creatinine, which is used to calculate eGFR (estimated glomerular filtration rate). An eGFR below 60 for three or more months indicates CKD. A urine test for albumin (a protein) can detect kidney damage even when eGFR is still normal. Both tests are routine and inexpensive. The National Kidney Foundation recommends that people with diabetes, high blood pressure, or a family history of kidney disease be screened regularly.

Does Medicare cover dialysis?
Yes. Medicare provides extensive coverage for dialysis regardless of age. Under the Medicare End-Stage Renal Disease (ESRD) program, individuals with permanent kidney failure who need regular dialysis qualify for Medicare, even if they are under 65. Medicare Part B covers outpatient dialysis, including hemodialysis and peritoneal dialysis. Medicare also covers kidney transplant evaluation and surgery. There are copayments and deductibles, and supplemental insurance or Medicaid can help cover those costs.

Can kidney disease be reversed?
In most cases, the damage from CKD is permanent. However, CKD progression can be slowed significantly, and in some cases stabilized, with good blood sugar and blood pressure control, SGLT2 inhibitors, dietary changes, and avoidance of nephrotoxic medications. If the kidney damage was caused by a reversible condition (such as a medication side effect, obstruction, or acute infection), some improvement in function is possible. The earlier CKD is detected and managed, the better the long-term outcomes.

What is the difference between dialysis and conservative management?
Dialysis mechanically filters waste from the blood when the kidneys can no longer do so adequately. It extends life but requires significant time commitment and carries risks. Conservative management focuses on controlling symptoms and maintaining quality of life through medications, diet, and supportive care without dialysis. Studies show that for very elderly or very frail patients, conservative management may provide similar survival time with better quality of life compared to dialysis. This is a personal decision that should be made with input from the patient, family, and medical team.

How do I know when my parent's kidney disease is getting worse?
Worsening kidney disease shows up in lab work before it shows up in symptoms. A declining eGFR over successive blood tests is the clearest indicator. Increasing protein in the urine is another sign. Symptomatically, worsening fatigue, increased swelling, appetite changes, nausea, confusion, and changes in urination patterns all suggest progression. If your parent's eGFR drops below 30, conversations about advanced planning (including dialysis decisions and advance directives) should begin in earnest.

What medications should my parent avoid with kidney disease?
NSAIDs (ibuprofen, naproxen, aspirin in high doses) can damage kidneys and should generally be avoided. Certain antibiotics, contrast dyes used in imaging studies, and some herbal supplements can also harm kidneys. Even some blood pressure medications need dose adjustment. Your parent's nephrologist or primary care doctor should review all medications, including over-the-counter drugs and supplements, to ensure nothing is accelerating kidney damage. Never stop a prescribed medication without consulting the doctor first.