Kidney disease in the elderly — the stages and what each means
This article is for educational purposes only and does not constitute medical, legal, or financial advice. Every family situation is different, and you should consult with appropriate professionals about your specific circumstances.
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 kidneys is failing. And the worst part is they probably won't feel much of anything until it's very advanced. Your parent might lose a kidney completely 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. Do they start dialysis or not? Is there time for other options? How much longer can they wait?
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, should have understood what those numbers meant, should have pushed them harder on diet and medication. But the truth is that kidney disease develops slowly, insidiously, in response to things that have been accumulating over a lifetime. And it doesn't announce itself. It just slowly takes away the kidney's ability to do its job.
The kidney's job, by the way, is more important than most people understand. It's not just about making urine. The kidneys filter waste from the blood, yes, but they also regulate blood pressure, control the balance of electrolytes and water in the body, 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. And because the kidney is a quiet organ, you're managing the effects of its failure long before you fully understand what's happening.
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.
The disease usually develops because something else has been damaging the kidneys for years. Diabetes is the most common cause, accounting for about a third of kidney disease cases. High blood pressure is nearly as common. Both of these conditions damage the delicate filtering structures in the kidney over time. Diabetes damages them through the high blood sugar itself and through the effects of high blood sugar on blood vessels. High blood pressure damages them through the constant pressure pushing against the fragile tissue. 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. It's just been developing for years, quietly, as a consequence of everything else their body has been managing.
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—it's going to get worse—but less predictable in speed. And this matters because speed changes the timeline for decisions.
Why It Happens: The Usual Suspects
If your parent has had diabetes for twenty years, you might already suspect kidney disease is coming. Diabetes damages kidneys relentlessly. The high blood sugar injures the glomeruli, the tiny filtering units in the kidney. It also damages the blood vessels that feed those filtering units. Over years, the damage accumulates, and the kidney's ability to filter waste decreases. This is called diabetic nephropathy, and it's one of the most common serious complications of diabetes. The frustrating part is that kidney disease from diabetes is largely preventable. Better control of blood sugar and blood pressure in earlier years prevents or slows the progression of kidney disease. But your parent is where they are now, with the years of management behind them, and the damage that's happened is what remains.
High blood pressure is similarly damaging. If your parent has had high blood pressure for thirty years, whether treated or not, it has been quietly damaging their kidneys. The pressure pushes against the delicate structures that filter blood, and over time, they break down. This is called hypertensive nephropathy. And like diabetic kidney disease, it's often preventable through good control of blood pressure, but that prevention had to happen years ago.
Some older adults develop kidney disease from repeated urinary tract infections or kidney infections. Some develop it from kidney stones that caused damage. Some develop it as a side effect of medications they've been taking for years. Nonsteroidal anti-inflammatory drugs, which include over-the-counter options like ibuprofen and naproxen, can damage kidneys, especially if taken regularly over years. Some blood pressure medications also stress the kidneys. Your parent's doctor should be aware of these risks, but sometimes the damage is already done.
Age itself is a risk factor. The kidneys, like every other system in the body, function less efficiently as we age. A person's kidney function naturally declines with age. This is normal and expected. But when a person also has diabetes, high blood pressure, or has been taking medications that stress the kidneys, that normal decline accelerates into disease.
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 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. The body retains fluid, and it accumulates in the tissues. For someone who already has arthritis or other problems with movement, swelling in the feet and ankles makes walking harder.
Changes in urination patterns should be noted. Your parent might have to urinate more frequently, especially at night. This is called nocturia, and it's common in kidney disease. 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. All of these changes are worth mentioning to their doctor.
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, and these products affect how food tastes. Your parent might start losing weight because they're eating less.
Confusion or cognitive changes should be taken seriously. Kidney disease can cause a buildup of toxins in the bloodstream that affect brain function. Your parent might seem foggy, might have trouble concentrating, might seem mildly confused. This is sometimes mistaken for early dementia, but it might be kidney-related. It's worth getting their kidneys checked if this is happening.
Nausea and vomiting sometimes occur. Your parent might feel queasy for no apparent reason, or they might vomit after eating. Again, this is from the buildup of waste products that the kidneys aren't filtering out properly.
High blood pressure that gets worse is a sign of kidney disease. Blood pressure and kidney function are intimately connected. When kidneys fail, blood pressure rises. When blood pressure is high, kidneys are damaged. It's a vicious cycle.
Difficulty catching their breath or chest pain needs immediate attention. Kidney disease can cause fluid to accumulate in the lungs, making breathing difficult. This is a medical emergency.
Treatment: Trying to Stop the Fall
In the early stages of kidney disease, the goal is to slow the decline. This is done primarily through management of the underlying conditions that are damaging the kidneys 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. Your parent might be started on medications that specifically protect the kidneys, such as ACE inhibitors or ARBs, which reduce the pressure in the kidneys' blood vessels.
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. It also might mean that your parent feels more restricted in their food choices than they already did if they have diabetes or heart disease.
Medications for managing the consequences of kidney disease are common. Your parent might take water pills (diuretics) to manage swelling and help their heart work more efficiently. They might take blood pressure medications if their blood pressure has risen. They might take medications to control phosphorus levels or potassium levels. They might take medications to help with anemia from the kidney disease. 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 of kidney health. They might need imaging to check for kidney stones or other problems. If kidney disease is advancing quickly, they might need more frequent testing. The doctor should be checking a measurement called glomerular filtration rate, or GFR, 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, and the body starts to accumulate toxins. When this happens, dialysis becomes a real option. Dialysis is a mechanical way of filtering waste from the blood, doing the job the kidneys can no longer do. 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. A person on dialysis still needs to manage diet carefully. They still might have medications to take. They still have kidney disease. Dialysis just prevents the accumulation of waste to the point where it becomes toxic.
There are two main types of dialysis. 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. Your parent would sit in a reclining chair with tubes connecting them to the machine. It's not painful, but it's time-consuming, and it requires that your parent be reliable about getting to appointments. 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, it sits there for several hours, then it's drained out, taking waste with it. This can be done overnight using a machine, or it can be done several times a day by hand. Peritoneal dialysis gives more flexibility in some ways but requires that your parent understand the procedure and follow sterile technique to avoid infection.
Both types of dialysis extend life. Dialysis was one of the great medical advances. People who would have died from kidney failure can now live for years or decades on dialysis. But dialysis is not transparent. It changes a person's life. Three days a week in a chair connected to a machine, or several exchanges a day of fluid and tubes,this becomes your parent's life. There are foods they can't eat. There are fluids they have to restrict. There are medical appointments that can't be moved. There are complications that can develop: infections, clotting, difficulties with the access point.
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. They might have advanced dementia. They might feel that the time on dialysis interferes too much with what makes their life meaningful. They might choose instead to manage the disease with medications and diet and to accept that their kidneys will eventually fail to the point where death becomes inevitable. This is called conservative management, and it's 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 include their nephrologist, their primary care doctor, you, and anyone else important to your parent's life. It should involve discussing not just whether dialysis is medically possible, but whether it aligns with your parent's values and goals. Does your parent want to extend life at almost any cost? Or do they want to prioritize other things, like minimizing hospital visits or maintaining independence in decision-making about their own body? Both are valid answers.
Living With the Disease: The Daily Adjustment
Whether your parent stays in the early stages of kidney disease 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. This means limited drinks, limited eating of foods with high water content, limited anything that involves fluid. In summer, in warm climates, or if they have heart failure, this restriction can feel unbearable.
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. Your parent might feel more limited, more monitored, less able to just eat what they want.
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. You might be managing the complicated schedule that dialysis creates.
If your parent stays on conservative management and doesn't choose dialysis, you become, partly, 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. You might be the one who helps them stay comfortable, who manages their symptoms, who helps them understand what's happening.
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.
How To Help Your Elders is an educational resource. We do not provide medical, legal, or financial advice. The information in this article is general in nature and may not apply to your specific situation. If you are concerned about a loved one's kidney health or kidney disease progression, consult with their healthcare provider or contact your local Area Agency on Aging for guidance and support.