Early Warning Signs of Kidney Disease, Recognizing Symptoms Before Crisis
09/29/2026
Kidney disease symptoms are easy to miss, because most people with early chronic kidney disease (CKD) feel completely normal. More than 1 in 7 U.S. adults, about 35.5 million people, have CKD, and as many as 1 in 10 of them do not know it (CDC, 2023).
Quick answer: what are the 3 early warning signs of kidney disease?
- Changes in urination: urinating more or less often, getting up at night to urinate, or foamy or bloody urine.
- Swelling (edema): puffiness in the feet, ankles, legs, hands or face.
- Persistent fatigue or weakness: tiredness that rest does not fix.
Signs of kidney failure appear when kidney function is severely reduced. They can add nausea or vomiting, loss of appetite, itching and dry skin, muscle cramps, trouble concentrating, and shortness of breath (NIDDK).
No symptom can diagnose kidney disease on its own. Two simple tests can find it: a blood test for kidney function (eGFR) and a urine test for protein (UACR). If you have diabetes, high blood pressure, heart disease or a family history of kidney disease, ask your doctor about both tests, even if you feel well.
Understanding Kidney Disease
The kidneys perform several important jobs in the body. They filter waste and excess fluid from the blood, help maintain the body’s fluid and mineral balance, and play an important role in blood pressure regulation.
The kidneys also balance sodium, potassium, calcium and phosphorus, and make hormones that control blood pressure, make red blood cells and keep bones strong. That is why kidney problems can show up in places that seem unrelated, such as fatigue from anemia or itching from mineral imbalance.
Chronic kidney disease occurs when the kidneys are damaged or have structural problems that affect how well they filter the blood. CKD can develop gradually, and diabetes and high blood pressure are the most common causes of CKD in adults.
As kidney function decreases, waste and excess fluid can build up in the body. Over time, CKD can progress to kidney failure, although the progression varies from person to person.
Can You Have Kidney Disease Without Symptoms?
Yes. This is one of the most important things to understand about CKD.
Many people with early CKD do not have noticeable symptoms. In some cases, a person may not know they have kidney disease until the condition has become more advanced. Blood and urine testing may identify kidney problems before symptoms become obvious.
This is particularly important for people who have conditions that increase their risk of kidney disease, such as diabetes or high blood pressure. The CDC reports that approximately 1 in 3 adults with diabetes and about 1 in 5 adults with high blood pressure have CKD.
So, feeling well does not always mean your kidneys are functioning normally.
What Are the 3 Early Warning Signs of Kidney Disease?
There is no single set of three symptoms that everyone with kidney disease will experience. However, changes in urination, swelling, and persistent fatigue are important symptoms to pay attention to, particularly when they are persistent or occur alongside known kidney disease risk factors.
1. Changes in Urination
Changes in urination are among the symptoms people often associate with kidney problems. You may notice that you are urinating more or less frequently, getting up more often during the night to urinate, or seeing changes in the appearance of your urine.
Foamy urine can sometimes be associated with protein in the urine, while blood in the urine can have several possible causes and should be medically evaluated. Albumin, a type of protein, can appear in urine when the kidney filters are damaged.
However, not every urinary change means you have kidney disease. Urinary symptoms can also occur with urinary tract infections, kidney stones, medications, prostate problems, and other conditions.
2. Swelling or Fluid Retention
Swelling, also called edema, can occur when the kidneys have difficulty removing excess fluid and salt from the body.
You may notice swelling in the:
- Feet
- Ankles
- Legs
- Hands
- Face
Edema is more commonly seen when kidney disease is advanced or when there is significant protein loss through the urine.
Persistent or unexplained swelling should be discussed with a healthcare professional because kidney disease is only one possible cause.
3. Persistent Fatigue or Weakness
Feeling tired after a busy day is normal. Persistent fatigue or weakness, however, can be associated with declining kidney function.
As CKD becomes more advanced, people may experience tiredness, sleep problems, difficulty concentrating, and other changes in how they feel. Anemia can also occur with kidney disease and contribute to fatigue.
Because fatigue is common with many health conditions, it should not be considered a specific sign of kidney disease on its own.
Common Symptoms of Kidney Disease
The symptoms of kidney disease can vary depending on the cause and how advanced the condition has become. Some people may have no symptoms, while others develop several changes as kidney function declines.
Shortness of Breath
Shortness of breath can occur in people with advanced kidney disease for several reasons.
Fluid accumulation can contribute to breathing problems, while anemia can reduce the amount of oxygen carried by the blood. However, shortness of breath can also indicate heart, lung, or other medical problems.
Sudden or severe difficulty breathing requires urgent medical attention.
Persistent Itching and Dry Skin
Itching and dry skin can occur as kidney disease becomes more advanced. NIDDK lists itching, dry skin, and changes in skin among possible symptoms of advanced CKD.
Persistent itching can have many causes, so it should not automatically be attributed to kidney disease. If it is severe, persistent, or accompanied by other symptoms, medical evaluation can help identify the cause.
Loss of Appetite, Nausea and Weight Changes
As kidney disease progresses, some people may experience:
- Loss of appetite
- Nausea
- Vomiting
- Unintentional weight loss
- Changes in taste
- Muscle cramps
These symptoms are more commonly associated with advanced kidney disease rather than the earliest stages.
A persistent loss of appetite or unexplained weight loss should always be discussed with a healthcare professional because many conditions can cause these changes.
High Blood Pressure and Kidney Disease
High blood pressure and kidney disease are closely connected.
High blood pressure can damage blood vessels in the kidneys over time, reducing their ability to function properly. At the same time, damaged kidneys can contribute to high blood pressure because they have difficulty maintaining the body’s fluid balance.
This creates an important cycle: uncontrolled high blood pressure can contribute to kidney damage, while kidney disease can make blood pressure more difficult to control.
For this reason, regularly monitoring and managing blood pressure is an important part of protecting kidney health.
Early Kidney Disease Symptoms vs. Kidney Failure Symptoms
It is important to distinguish between early CKD symptoms and symptoms associated with more advanced kidney disease.
| Stage | eGFR (mL/min/1.73 m²) | What it means |
|---|---|---|
| Stage 1 (G1) | 90 or above | Normal filtering, but signs of kidney damage such as albumin in the urine |
| Stage 2 (G2) | 60–89 | Mildly decreased function plus signs of damage |
| Stage 3a / 3b (G3) | 45–59 / 30–44 | Moderately decreased function |
| Stage 4 (G4) | 15–29 | Severely decreased function |
| Stage 5 (G5) | Below 15 | Kidney failure |
Stage 1 and stage 2 kidney disease symptoms are rare, which is why searches for “early stage kidney disease symptoms” often turn up very little. G1 and G2 only count as CKD when there is other evidence of kidney damage. An eGFR above 60 on its own does not rule CKD out if your urine shows albumin.
What Are the Symptoms of Kidney Failure?
Kidney failure symptoms generally become more noticeable when kidney function has become severely reduced. Some people, however, may have kidney disease for years before realizing it.
Possible signs of kidney failure include:
- Significant fatigue or weakness
- Nausea or vomiting
- Loss of appetite
- Swelling caused by fluid retention
- Changes in how often you urinate
- Itching or dry skin
- Difficulty concentrating
- Shortness of breath
- Muscle cramps
- Changes in sleep
The National Kidney Foundation notes that kidney failure is associated with severe loss of kidney function, and people with kidney failure generally require kidney replacement treatment such as dialysis or a kidney transplant.
Importantly, having one or more of these symptoms does not mean that someone has kidney failure. Many of these symptoms can occur with other health conditions. Kidney function testing is necessary to determine what is happening.
What Causes Kidney Disease?
Kidney disease can develop for many different reasons. Some causes can be managed or treated, while others may be related to inherited or underlying health conditions.
Two of the most common causes of chronic kidney disease in adults are diabetes and high blood pressure. Both conditions can damage the blood vessels and filtering structures in the kidneys over time.
Other possible causes and contributors include:
- polycystic kidney disease (PKD) and other inherited kidney conditions; PKD is the fourth leading cause of kidney failure and accounts for about 5% of cases (CDC Kidney Disease Surveillance System)
- autoimmune diseases such as lupus and IgA nephropathy
- a previous kidney injury, repeated kidney infections, or long-term urinary blockage (for example from stones or an enlarged prostate)
- regular, long-term use of medicines that can harm the kidneys, such as high doses of NSAID pain relievers, especially when you already have kidney problems
Understanding the underlying cause is important because treatment often focuses on both protecting kidney function and managing the condition responsible for the damage.
Who Is at Higher Risk of Kidney Disease?
Not everyone has the same risk of developing kidney disease. Some people may need regular kidney testing even when they do not have noticeable kidney disease symptoms.
Risk can be higher for people who have:
- Diabetes
- High blood pressure
- Heart disease
- A family history of kidney disease
- Previous kidney problems or kidney injury
- Certain inherited or autoimmune conditions
- Older age
The CDC recommends that people with risk factors such as diabetes or high blood pressure talk with their healthcare provider about kidney disease testing.
This is especially important because early CKD may not cause obvious signs of kidney problems. Testing can identify changes before symptoms become noticeable.
When Should You See a Doctor About Kidney Symptoms?
Not every change in urination, tiredness, or swelling means you have kidney disease. However, symptoms that persist, worsen, or occur alongside known risk factors deserve medical attention.
Consider speaking with a healthcare professional if you experience:
- Persistent changes in urination
- Blood in your urine
- Ongoing swelling in your legs, feet, ankles, hands, or face
- Unexplained or persistent fatigue
- Repeated nausea or loss of appetite
- Persistent itching
- High blood pressure
- Unexplained changes in weight
- Several symptoms occurring at the same time
You should also discuss kidney screening with your healthcare provider if you have diabetes, high blood pressure, or a family history of kidney disease.
The goal is not to diagnose kidney disease based on symptoms alone. Instead, these symptoms can be a reason to seek appropriate testing.
When Are Kidney Symptoms an Emergency?
Some symptoms require immediate medical attention rather than waiting for a routine appointment.
Seek urgent medical care for symptoms such as:
- Severe or sudden difficulty breathing
- Chest pain
- Severe confusion or a major change in alertness
- Severe weakness
- Very little or no urine, particularly when accompanied by other concerning symptoms
These symptoms can have many possible causes, some of which may be emergencies. Do not assume they are caused by kidney disease.
How Is Kidney Disease Diagnosed?
Two routine tests diagnose and monitor CKD: a blood test for eGFR and a urine test for albumin (NIDDK). Because one abnormal result can be temporary, doctors usually repeat them; CKD is confirmed when abnormal results last more than 3 months.
| Test | What it measures |
|---|---|
| Serum creatinine (blood) | A waste product from normal muscle breakdown that healthy kidneys remove |
| eGFR (calculated from blood creatinine, sometimes plus cystatin C) | How well the kidneys filter blood |
| Urine albumin-to-creatinine ratio (UACR) | Albumin (protein) leaking into the urine |
| Urinalysis / dipstick | Blood, protein, sugar, signs of infection |
| Blood pressure | Pressure on blood vessel walls |
| Kidney ultrasound or CT scan | Kidney size and structure |
| Kidney biopsy | A small sample of kidney tissue |
The KDIGO 2024 guideline encourages adding cystatin C, a second blood marker, when a more accurate eGFR is needed, because creatinine depends on muscle mass (Delanaye et al., 2025). Blood pressure cut-off from NIDDK.
A kidney biopsy is not needed for everyone. It is usually reserved for when the cause or type of damage is unclear.
If you already have CKD, the same tests show whether treatment is working: a stable eGFR and a stable or falling UACR are good signs. Keep a record of your results over time.
How Is Kidney Disease Treated?
Treatment depends on the cause and stage of kidney disease, as well as a person’s overall health.
The goal may be to treat the underlying condition, control risk factors, protect remaining kidney function, and manage symptoms or complications.
Lifestyle Changes
Depending on your individual situation, a healthcare professional may recommend:
- Managing blood pressure
- Controlling blood sugar if you have diabetes
- Following an appropriate eating plan
- Limiting sodium when advised
- Staying physically active
- Maintaining a healthy weight
- Following individualized fluid recommendations
- Avoiding inappropriate or excessive use of medications that can harm the kidneys
There is no single diet or lifestyle plan that works for everyone with kidney disease. Nutritional and fluid recommendations can change depending on kidney function and other health conditions.
Medications and Medical Treatment
Doctors may prescribe medications to manage conditions that contribute to kidney disease or its complications.
Depending on the individual, treatment may include medications for:
- High blood pressure
- Diabetes
- Protein in the urine
- Fluid retention
- Anemia
- Other complications associated with declining kidney function
Treatment should always be individualized by a healthcare professional.
What Treatment Options Are Available for Kidney Failure?
When kidney function falls to about 15% or below, most people need kidney replacement therapy. NIDDK describes three main treatment options and a conservative-care path (NIDDK).
Hemodialysis
Hemodialysis uses a machine and a special filter to clean waste and extra fluid from the blood. It can be done in a dialysis center or, for eligible patients, at home.
Peritoneal dialysis
Peritoneal dialysis uses the lining of the abdomen as a natural filter, with cleansing fluid exchanged through a catheter. It is usually done at home.
Kidney transplant
A transplant places a healthy donor kidney into a person whose kidneys have failed. It is not an option for everyone, and candidates go through a full medical evaluation. In 2023, 27,332 kidney transplants were performed in the U.S., while more than 90,000 people were on the waiting list in late 2024 (NIDDK).
Supportive or conservative care
Some people with kidney failure choose not to start dialysis or have a transplant. They continue to receive care focused on managing symptoms and quality of life. Decisions about treatment should be made with your healthcare team based on your health, preferences and goals.
Home Hemodialysis for Kidney Failure
For some people with kidney failure, home hemodialysis can provide an alternative to receiving treatment exclusively at a dialysis center.
Instead of traveling to a center for every treatment, eligible patients receive dialysis at home using equipment provided through their dialysis program. Patients and their care partners may receive training on how to safely perform treatments and respond to common situations.
Potential benefits can include greater flexibility around treatment scheduling and the ability to receive treatment in a familiar environment. However, home dialysis also requires training, preparation, appropriate equipment, and ongoing clinical support.
Dialyze Direct provides home dialysis services designed to support eligible patients who choose home-based treatment. If you are considering home hemodialysis, your healthcare team can help determine whether it is appropriate for your medical needs and circumstances.
Learn more about home dialysis with Dialyze Direct.
Frequently Asked Questions
For most people, the first sign of kidney problems is not a symptom at all but an abnormal test: albumin in the urine (UACR above 30 mg/g) or an eGFR below 60. When symptoms do appear first, they are usually changes in urination, foamy urine, or swelling in the ankles or feet.
Five common signs of bad kidneys are changes in how often you urinate, foamy or bloody urine, swelling in the legs, ankles or face, persistent fatigue, and itching with dry skin. Nausea, appetite loss and muscle cramps often follow as kidney damage advances. Any of these deserves a kidney function test.
Early signs of kidney failure include worsening swelling, tiredness during the day with poor sleep at night, itching, nausea or loss of appetite, and making less urine. These develop gradually, so many people do not notice them right away (NIDDK).
You cannot tell from how you feel, because as many as 9 in 10 adults with CKD do not know they have it (CDC, 2023). Ask your doctor for an eGFR blood test and a UACR urine test, especially if you have diabetes, high blood pressure, heart disease or a family history of kidney failure.
Get tested before symptoms start. People with diabetes should have kidney testing every year, and people with high blood pressure, heart disease or a family history of kidney failure should ask how often to be tested (NIDDK).
Occasional bubbles are normal, especially with a strong stream. Urine that stays foamy every time can mean protein is leaking through damaged kidney filters. A simple UACR urine test can check.
Some kidney diseases, such as polycystic kidney disease, are inherited, and CKD in general runs in families. Having a close relative with kidney disease raises your risk (CDC), so tell your doctor about your family history.
Key Takeaways
Kidney disease can develop gradually, and early kidney disease may cause few or no noticeable symptoms. Recognizing potential signs can help you know when to discuss your health with a healthcare professional.
Remember:
- Changes in urination, swelling, and persistent fatigue can be possible signs of kidney problems.
- CKD symptoms can become more noticeable as kidney function declines.
- Kidney failure symptoms can include significant fatigue, nausea, appetite changes, swelling, itching, and changes in urination.
- Symptoms alone cannot diagnose kidney disease or determine its stage.
- Blood tests, urine tests, blood pressure measurements, and other evaluations can help identify kidney disease.
- Diabetes and high blood pressure are important kidney disease risk factors.
- People with kidney failure may have treatment options that include in-center dialysis, home hemodialysis, kidney transplantation, or supportive care, depending on their individual circumstances.
If you have symptoms or risk factors for kidney disease, talk with a healthcare professional about appropriate testing and next steps. For people who have been diagnosed with kidney failure and are exploring treatment options, home hemodialysis may be an option worth discussing with their care team.
To learn more about home dialysis and the support available through Dialyze Direct, visit Dialyze Direct.
References and links
- https://www.kidney.org/kidney-topics/chronic-kidney-disease-ckd/
- https://www.webmd.com/a-to-z-guides/ss/slideshow-kidney-warning-signs
- https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/tests-diagnosis
- https://www.nhs.uk/conditions/kidney-disease/diagnosis/
- https://www.mayoclinic.org/diseases-conditions/chronic-kidney-disease/diagnosis-treatment/drc-20354527
- https://my.clevelandclinic.org/health/diseases/17689-kidney-failure
Disclaimer: Information contained in this blog is for informational or educational purposes only and does not substitute professional medical advice or consultations with healthcare professionals. The content is not intended to be comprehensive or exhaustive, and it does not apply to any specific individual’s medical condition. Always refer to the personalized information given to you by your doctor, or contact us directly.
Review:
This content has been reviewed by Dr. Allen Kaufman, Chief Medical Officer at Dialyze Direct, to ensure clinical accuracy and reliability..
Dr. Allen Kaufman is the Chief Medical Officer and Senior VP for Clinical & Scientific Affairs at Dialyze Direct, with over four decades of experience in Nephrology. He began his career in 1980 and has held leadership roles including Chief of Nephrology & Hypertension at Beth Israel Medical Center (1998–2004), Chief of Dialysis at the Bronx VA Medical Center (1982–1990), and Chief of the Yorkville Dialysis Unit at Beth Israel and the Renal Research Institute (1990–2000). Dr. Kaufman has authored over 100 scientific publications and served as Principal or Co-Investigator on numerous NIH-funded research studies. A Fellow of the American College of Physicians, he is board-certified in Nephrology and Internal Medicine. He earned his medical degree from the University of Rochester and completed training at the Hospital of the University of Pennsylvania and Mount Sinai in New York. Dr. Kaufman is widely recognized with multiple “Best Doctor” and “Patients’ Choice” awards.