End-stage renal disease (ESRD) is the final stage of chronic kidney disease, when the kidneys have lost nearly all their ability to filter waste and excess fluid from the blood. It’s defined by a kidney filtration rate below 15 mL per minute, compared to a normal rate of around 90 or higher. At this point, survival requires either dialysis or a kidney transplant. As of 2023, roughly 831,000 Americans are living with kidney failure, an all-time high.
How Kidney Failure Is Classified
Chronic kidney disease is measured in five stages based on your estimated glomerular filtration rate (eGFR), which tells you how well your kidneys are cleaning your blood. Stage 4 means your filtration rate has dropped to between 15 and 29. Stage 5, or ESRD, means it has fallen below 15 or you’re already on dialysis. The decline from early kidney disease to ESRD can take years or even decades, but it can also accelerate quickly if the underlying cause isn’t controlled.
A diagnosis of chronic kidney disease requires that reduced function or kidney damage persists for at least three months. Damage can show up as protein or blood in the urine, structural abnormalities seen on imaging, or abnormal biopsy results.
What Causes It
Two conditions drive the vast majority of kidney failure. Diabetes accounts for about 47% of new ESRD cases, and high blood pressure accounts for another 29%. Together, they’re responsible for roughly three out of every four people who start dialysis. The remaining quarter comes from a mix of causes: autoimmune diseases that attack the kidney’s filtering units, inherited conditions like polycystic kidney disease, chronic urinary tract obstructions, and repeated kidney infections.
In diabetes, persistently high blood sugar damages the tiny blood vessels inside the kidneys over time, gradually reducing their filtering capacity. High blood pressure works similarly, putting constant strain on those same delicate vessels. Both conditions are manageable with medication and lifestyle changes, which is why early detection and blood pressure or blood sugar control are the most effective ways to slow progression toward kidney failure.
How It Feels as Kidneys Fail
Early-stage kidney disease is often silent. Most people feel nothing until they’ve already lost a significant portion of kidney function. By the time ESRD develops, waste products build up in the blood faster than the body can handle. This toxic buildup, called uremia, produces a wide range of symptoms that tend to worsen together.
Nausea, vomiting, and loss of appetite are typically the first things people notice. Food may taste metallic or unappealing, and some people lose interest in eating after just a few bites. Persistent, severe itching is common as mineral levels in the blood become unbalanced. In rare cases, dried sweat can leave yellowish-white crystals on the skin.
The nervous system takes a hit too. Difficulty concentrating and memory problems develop as toxins accumulate. Muscle twitching, restlessness, and hiccups that won’t quit can interfere with sleep and daily life. In severe, untreated cases, uremia can progress to seizures or coma. Other common symptoms include swelling in the legs and feet from fluid retention, fatigue that doesn’t improve with rest, and shortness of breath.
Treatment Options
Once kidneys can no longer sustain life on their own, there are two paths: dialysis to do the kidneys’ job mechanically, or transplantation to replace the failed organs entirely.
Hemodialysis
The most common form of dialysis filters your blood through a machine at a dialysis center. Standard in-center hemodialysis runs three times per week, with each session lasting about four hours. That means roughly 12 hours a week connected to a machine, plus travel time and recovery afterward. Many people feel drained for several hours after a session. Home hemodialysis is an option for some, allowing more flexible scheduling and sometimes shorter, more frequent sessions.
Peritoneal Dialysis
This approach uses the lining of your abdomen as a natural filter. A fluid is introduced through a small, permanently placed catheter, absorbs waste, and is then drained out. Many people do this overnight using a small machine called a cycler, which runs while they sleep. Others perform about four manual exchanges during the day, each taking 15 to 30 minutes. Total time commitment is generally under 10 hours per week, and because it’s done at home, it allows more independence than in-center hemodialysis.
Kidney Transplant
Transplantation offers the best long-term outcomes. In a study of patients 70 and older, those who received a kidney transplant had a five-year survival rate of 80%, compared to 53% for matched patients who stayed on dialysis. Younger recipients generally do even better. The trade-off is a lifetime of anti-rejection medications, which suppress part of the immune system and increase susceptibility to infections.
The biggest barrier is availability. Over 103,000 people are currently on the national transplant waiting list, and kidneys are the most in-demand organ. Wait times vary widely by region and blood type but can stretch to several years. A kidney from a living donor, when available, typically functions longer than one from a deceased donor.
The Heart-Kidney Connection
Cardiovascular disease is the leading cause of death in people with chronic kidney disease, and many patients with declining kidney function die from heart-related events before ever reaching dialysis. The relationship runs in both directions: failing kidneys worsen heart health, and heart problems accelerate kidney decline. Fluid overload strains the heart. Mineral imbalances disrupt heart rhythm. Widespread blood vessel damage from the same conditions that caused kidney failure (diabetes, high blood pressure) also affects the heart and brain.
This is why managing cardiovascular risk factors is just as critical as managing the kidneys themselves. Blood pressure control, cholesterol management, and avoiding smoking all directly affect how long and how well someone with ESRD lives.
Dietary Changes in Kidney Failure
When your kidneys can’t regulate minerals and fluid on their own, your diet has to do much of that work. The general population is advised to keep sodium under 2,300 milligrams per day, but most people with ESRD need to go lower. Potassium and phosphorus, two minerals the kidneys normally excrete, also need to be limited because dangerous buildups can affect heart rhythm and bone health. There are no universal targets for these nutrients because the right limits depend on your lab results, the type of dialysis you’re on, and how much residual kidney function you still have.
Fluid restriction is another reality for many people on dialysis, particularly those who produce little or no urine. A common starting point is around 32 ounces per day, but your dialysis team will adjust this based on how much fluid builds up between sessions. Practically, that means being strategic about when and how much you drink, and accounting for liquid in foods like soups, ice cream, and fruits with high water content.
Working with a renal dietitian makes a measurable difference. They can help you find substitutions that keep meals satisfying while staying within safe limits for your body.
Living With ESRD
A diagnosis of kidney failure changes daily life in concrete ways. Dialysis schedules structure the week. Energy levels fluctuate, often dipping after treatments. Dietary restrictions limit what you can eat at restaurants or social gatherings. Travel requires planning around dialysis access or portable equipment.
But the picture isn’t uniformly grim. Many people on dialysis continue working, exercising, and traveling with advance coordination. Peritoneal dialysis offers more day-to-day flexibility. And for those who receive a transplant, life can feel remarkably normal between routine follow-up appointments. The key variables that shape quality of life are how well other conditions like diabetes and heart disease are controlled, how early treatment begins, and what type of renal replacement therapy fits someone’s lifestyle and medical profile.