Kidney Failure Symptoms: What to Expect in Stage 4 and Stage 5 CKD

Kidney failure — also called end-stage renal disease (ESRD) or stage 5 CKD — occurs when your kidneys can no longer function well enough to sustain your health on their own. This generally means your GFR (glomerular filtration rate) has dropped below 15 mL/min.

At this point, your kidneys are filtering less than 15% of what they normally would. Waste products and excess fluid build up in your body, and treatment — either dialysis or a kidney transplant — becomes necessary to do the work your kidneys can no longer do.

Kidney failure does not happen suddenly for most people. It is usually the result of chronic kidney disease that has progressed over months or years. Understanding the symptoms can help you prepare, plan, and make informed decisions about your care.

One of the most frustrating aspects of kidney disease is that symptoms often do not appear until significant damage has already occurred. The kidneys have remarkable reserve capacity — even when function is reduced by 50% or more, you may feel perfectly fine.

This is why CKD is sometimes called a "silent disease." Many patients are diagnosed through routine blood work long before they feel anything wrong. By the time noticeable symptoms develop, kidney function has usually declined to stage 3b, 4, or 5.

The symptoms described in this article tend to appear in stage 4 (GFR 15–29) and become more pronounced in stage 5 (GFR below 15). If you are in an earlier stage and feel fine, that is actually normal — but it does not mean nothing is happening. Keep up with your blood work and follow your treatment plan.

The following symptoms are the most commonly reported by patients with advanced CKD. Not everyone experiences all of them, and severity varies from person to person. What matters is recognizing patterns and communicating changes to your doctor.

This is often the first symptom patients notice — and the one that affects daily life the most. The fatigue of kidney failure is different from ordinary tiredness. It is a deep, persistent exhaustion that does not improve with rest.

Why it happens: Declining kidneys produce less erythropoietin (EPO), a hormone that tells your bone marrow to make red blood cells. Fewer red blood cells means less oxygen reaching your muscles and brain — a condition called anemia. Waste buildup in your blood (uremia) also contributes to feeling drained.

If you find yourself needing to rest more, struggling to get through your normal routine, or feeling weak for no clear reason, this is worth reporting to your doctor. Anemia can often be treated with medications or iron supplements.

When kidneys cannot remove enough fluid from your body, it accumulates in your tissues. This commonly appears as swelling in the ankles, feet, legs, hands, or face — especially around the eyes in the morning.

You might notice that your shoes feel tight, your rings do not fit, or your socks leave deep imprints on your legs. Some patients experience rapid weight gain over a few days — this is often fluid, not fat.

Why it matters: Fluid overload can put dangerous strain on your heart and lungs. If you notice sudden or worsening swelling, contact your doctor promptly. Fluid management through diet (sodium restriction), medications (diuretics), and eventually dialysis is a core part of kidney failure treatment.

Since the kidneys produce urine, it makes sense that kidney failure affects urination. Changes can include:

• Decreased urine output — Making noticeably less urine than usual.
• Increased frequency at night — Needing to get up multiple times (nocturia).
• Foamy or bubbly urine — This can indicate excess protein leaking through the kidneys.
• Dark, concentrated urine — Or in some cases, very pale urine as the kidneys lose concentrating ability.
• Blood in urine — Not always visible. Sometimes only detected by lab tests.

Any significant change in your urination pattern is worth mentioning to your doctor. These changes can be gradual, so it helps to pay attention over time.

As waste products build up in your blood (a condition called uremia), you may experience persistent nausea, vomiting, or a general loss of appetite. Food may taste metallic or different than it used to. Some patients describe a constant bad taste in their mouth.

This can lead to unintentional weight loss and malnutrition — which is particularly concerning because kidney patients need adequate nutrition to maintain strength. If you are struggling to eat, a renal dietitian can help you find foods that are tolerable and nutritious.

Nausea and appetite changes that worsen over time are often a sign that kidney function has declined further and treatment adjustments may be needed.

Persistent, unexplained itching (pruritus) is one of the more uncomfortable symptoms of kidney failure. It can range from mild to severe and is often worse at night, disrupting sleep.

Why it happens: When kidneys cannot properly filter waste, minerals like phosphorus build up in the blood. High phosphorus levels cause intense itching. Dry skin — common in kidney failure — makes it worse.

You may also notice that your skin looks paler or has a yellowish tint. Some patients develop dry, flaky patches. Keeping phosphorus levels in check (through diet and medications called phosphate binders), using fragrance-free moisturizers, and staying hydrated can help manage these symptoms.

Feeling breathless during activities that used to be easy — climbing stairs, walking to the car, or even lying flat — can be a sign of advancing kidney failure.

Two main causes:

• Fluid overload — Excess fluid can collect around the lungs (pleural effusion) or in the lung tissue (pulmonary edema), making it harder to breathe.
• Anemia — With fewer red blood cells carrying oxygen, your body has to work harder to deliver oxygen to your tissues, which feels like breathlessness.

Sudden or severe shortness of breath is a medical emergency and you should seek immediate care. Gradual breathlessness that worsens over weeks should be discussed with your nephrologist at your next visit — or sooner if it affects your daily activities.

When waste products accumulate in the blood, they can affect brain function. Patients often describe this as "brain fog" — difficulty concentrating, forgetfulness, feeling mentally sluggish, or having trouble finding words.

This is caused by uremic toxins circulating in the bloodstream and can be worsened by anemia (less oxygen reaching the brain) and sleep disruption from other symptoms like itching or frequent nighttime urination.

If you notice cognitive changes, mention them to your doctor. These symptoms often improve significantly once dialysis begins or a transplant is performed, because the underlying cause — waste buildup — is addressed directly.

Beyond the most common symptoms, kidney failure can cause a range of other issues. Not every patient experiences these, but it helps to be aware:

• Muscle cramps — Especially in the legs, often at night. Caused by electrolyte imbalances.
• Restless legs — An uncomfortable urge to move your legs, particularly when resting. Common in CKD.
• Sleep problems — Insomnia, restless sleep, and sleep apnea are all more common in kidney failure.
• High blood pressure — The kidneys help regulate blood pressure. As they fail, blood pressure often rises and becomes harder to control.
• Bone and joint pain — CKD affects calcium and phosphorus balance, which can weaken bones over time (renal osteodystrophy).
• Chest pain — Can occur if fluid accumulates around the heart (pericarditis). This requires immediate medical attention.
• Easy bruising or bleeding — Kidney failure can affect how your blood clots.

These symptoms can overlap with many other conditions, which is one reason kidney disease is sometimes diagnosed late. If you are already being monitored for CKD, reporting these symptoms helps your doctor adjust your care plan.

Not every symptom requires an emergency visit, but some changes should prompt an immediate call to your nephrologist or a trip to the emergency room:

• Sudden severe shortness of breath — Could indicate fluid overload or a cardiac issue.
• Chest pain or pressure — Always take this seriously.
• Very little or no urine output — This can signal acute kidney injury on top of CKD.
• Confusion or extreme drowsiness — May indicate dangerous levels of uremic toxins.
• Persistent vomiting — Can lead to dehydration and worsen kidney function.
• Rapid, unexplained weight gain — Likely fluid retention that needs immediate management.
• Heart palpitations or irregular heartbeat — Could signal dangerous potassium levels.

For less urgent symptoms — increasing fatigue, gradual swelling, worsening itching — make note of them and bring them up at your next appointment. Keeping a simple symptom journal can help your doctor see patterns and make better decisions about your care.

If you are experiencing symptoms of kidney failure, it means your body is telling you that your kidneys need help. The next step is not something to fear — it is something to prepare for.

Your two main treatment options are:

• Dialysis — A medical treatment that filters your blood, doing the work your kidneys can no longer do. There are two types: hemodialysis (typically at a center, 3 times per week) and peritoneal dialysis (at home, daily). Both are effective and the choice depends on your lifestyle, health, and preferences.
• Kidney transplant — Receiving a healthy kidney from a living or deceased donor. A successful transplant restores kidney function and eliminates the need for dialysis. Not everyone is a candidate, and the wait for a deceased donor kidney can be years — which is why early planning matters.

Why early preparation matters: Patients who plan ahead for dialysis (for example, by having vascular access created in advance) and who are evaluated early for transplant tend to have significantly better outcomes. Starting dialysis emergently — without preparation — is associated with more complications and a harder adjustment period.

Talk to your nephrologist about your treatment preferences early. If transplant is an option, getting on the waiting list or finding a living donor takes time. If dialysis is the path forward, understanding your options and preparing physically and emotionally makes the transition smoother.

A diagnosis of kidney failure can feel overwhelming. But it is important to know this: many people live full, active, meaningful lives with kidney failure. Treatment has advanced enormously, and with the right support, patients work, travel, exercise, and enjoy their families.

The symptoms described in this article are real and should be taken seriously — but they are also manageable. Many symptoms improve dramatically once treatment begins. Fatigue eases. Swelling goes down. Mental clarity returns. Nausea resolves.

What matters most is that you do not navigate this alone. Build a care team you trust — a nephrologist, a renal dietitian, a social worker who specializes in kidney disease. Connect with other patients through support groups or online communities. And use resources like this site to understand what is happening and why.

Knowledge does not replace your doctor, but it helps you work with your doctor more effectively. You are not just a patient — you are an active participant in your own care.