17 Signs of Kidney Trouble You Can See — Don’t Ignore #3!
Your kidneys work quietly every day, filtering your blood, removing waste and extra fluid, balancing minerals, and helping your body maintain healthy blood pressure and red blood cell production.
The problem is that kidney disease can develop silently. In its early stages, many people have no noticeable symptoms at all. That means visible or noticeable changes that do appear should not automatically be dismissed, especially if they persist or occur together with other symptoms.
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Institut National du Diabète et des Maladies Digestives et Rénales
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Some warning signs can be seen in your urine, skin, eyes, face, hands, legs, and feet. Others are symptoms you can feel, such as unusual tiredness, nausea, itching, or changes in urination.
Here are 17 possible signs of kidney trouble you should know about — including one important sign many people overlook.
1. Puffy Eyes, Especially in the Morning
One of the changes people sometimes notice is puffiness around the eyes.
Swelling can occur when the body retains excess fluid. In some kidney conditions, protein can leak into the urine, contributing to fluid accumulation and swelling.
Puffy eyes can also have many other causes, including allergies, lack of sleep and other medical conditions. So this sign alone does not mean you have kidney disease.
However, persistent puffiness—particularly when it occurs along with swelling elsewhere—deserves attention.
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National Kidney Foundation
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2. Swollen Ankles and Feet
Swelling in the lower legs, ankles and feet is another possible sign of reduced kidney function.
Healthy kidneys help remove excess salt and fluid from the body. When kidney function is impaired, extra fluid can accumulate in tissues, causing edema.
You might notice that your shoes feel tighter than usual or that your ankles look unusually swollen at the end of the day.
Swelling can also be caused by heart problems, certain medications, venous problems and other conditions, so it should not automatically be blamed on the kidneys.
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Institut National du Diabète et des Maladies Digestives et Rénales
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3. Foamy or Very Frothy Urine — Don’t Ignore This
This is the sign people should pay particular attention to.
Occasional bubbles in urine can happen for completely harmless reasons, such as the force of the urine hitting the toilet water.
But urine that repeatedly appears unusually foamy or frothy can sometimes be associated with protein in the urine.
Protein, particularly albumin, can leak into urine when the kidney's filtering structures are damaged. Persistent protein in the urine can be an important marker of kidney disease.
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National Kidney Foundation
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If you regularly notice unusually foamy urine, especially if it is accompanied by swelling around the eyes, ankles or feet, talk with a healthcare professional.
A simple urine test can check for albumin and other abnormalities.
4. Blood in the Urine
Urine that appears pink, red, brown or cola-colored can sometimes contain blood.
Blood in the urine is known as hematuria and can have many causes. Some are related to the urinary tract, while others can involve the kidneys.
Kidney conditions affecting the filtering units can cause blood cells to appear in the urine.
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Institut National du Diabète et des Maladies Digestives et Rénales
Visible blood in urine should not simply be ignored.
Even when there is no pain, it is worth discussing with a healthcare professional so the cause can be identified.
5. Urinating More Often
A noticeable increase in how frequently you urinate can have several explanations.
Some people may find themselves needing to use the bathroom more often, particularly during the night.
Frequent urination can occur with certain kidney conditions, but it can also be caused by diabetes, urinary infections, an enlarged prostate, increased fluid intake and other conditions.
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National Kidney Foundation
If the change is persistent or unusual for you, it is worth getting checked rather than assuming it is simply part of getting older.
6. Urinating Less Than Usual
The opposite change can also be important.
A significant decrease in urine production may occur when kidney function suddenly worsens or when the body is dealing with another serious problem.
Acute kidney injury, for example, can cause decreased urine output and may occur alongside swelling, fatigue, nausea, shortness of breath or confusion.
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National Kidney Foundation
A sudden major reduction in urination should receive prompt medical attention, particularly if you are also feeling very unwell.
7. Swelling in Your Hands
Kidney-related fluid retention is not limited to the feet.
Some people can develop swelling in their hands, arms or face.
You may notice that rings feel tighter than normal or that your fingers look puffy.
When the kidneys cannot effectively remove excess salt and fluid, edema can develop in different parts of the body.
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Institut National du Diabète et des Maladies Digestives et Rénales
Again, swelling has many possible causes, so the pattern and other symptoms matter.
8. Dry, Itchy Skin
Persistent itching and unusually dry skin can occur in advanced kidney disease.
As kidney function declines, the body can have difficulty maintaining the appropriate balance of minerals and other substances in the blood.
Kidney disease-related itching is particularly associated with more advanced disease rather than being a reliable sign of early kidney problems.
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Institut National du Diabète et des Maladies Digestives et Rénales
If you have unexplained, persistent itching—especially alongside swelling, fatigue or changes in urination—medical evaluation may be appropriate.
9. Unexplained Fatigue
Feeling tired after a busy day is normal.
But persistent fatigue that does not improve with adequate rest can be different.
Advanced kidney disease can cause tiredness and weakness for several reasons, including anemia and the buildup of waste products in the body.
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Institut National du Diabète et des Maladies Digestives et Rénales
Some people describe feeling unusually weak, lacking energy or struggling to complete everyday activities.
Fatigue is extremely common and can be caused by countless conditions, so it is not specific to kidney disease.
Still, unexplained long-lasting fatigue should not be ignored.
10. Trouble Concentrating
Kidney problems can sometimes affect how a person feels mentally.
As kidney function becomes severely reduced, waste products can build up in the blood and contribute to problems such as difficulty concentrating, confusion or changes in mental alertness.
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Institut National du Diabète et des Maladies Digestives et Rénales
You might notice that tasks requiring concentration seem harder than usual or that you have difficulty staying focused.
Mild concentration problems have many possible causes, including stress, poor sleep and medications.
But significant or worsening confusion requires medical attention.
11. Loss of Appetite
A reduced appetite can occur when kidney disease becomes more advanced.
Waste buildup and changes in the body's chemistry can make food less appealing and may sometimes cause nausea or changes in taste.
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Institut National du Diabète et des Maladies Digestives et Rénales
If someone consistently has little interest in food and is also losing weight or experiencing nausea, weakness or swelling, they should speak with a healthcare professional.
Unintentional appetite changes should not simply be blamed on aging.
12. Nausea or Vomiting
Nausea can occur for countless reasons, including infections, digestive problems, medications and food-related illness.
However, nausea and vomiting can also occur in advanced kidney disease when waste products accumulate in the body.
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Institut National du Diabète et des Maladies Digestives et Rénales
Persistent nausea becomes more concerning when it appears together with other possible kidney-related symptoms such as swelling, reduced urination, severe fatigue or loss of appetite.
Severe or repeated vomiting can itself cause dehydration, which may place additional stress on the kidneys.
13. Muscle Cramps
Unexpected muscle cramps, particularly in the legs, can occur in people with kidney disease.
The kidneys help regulate minerals and electrolytes in the body. When kidney function is significantly impaired, these balances can become disrupted.
Muscle cramps are also extremely common in people without kidney disease, so this symptom alone cannot identify a kidney problem.
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Institut National du Diabète et des Maladies Digestives et Rénales
If frequent cramps occur with other symptoms, however, it is worth discussing them with a healthcare professional.
14. Shortness of Breath
Shortness of breath can sometimes occur with advanced kidney disease.
One reason is fluid buildup, which can contribute to breathing problems. Anemia and other complications can also contribute to fatigue and breathlessness.
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Institut National du Diabète et des Maladies Digestives et Rénales
Shortness of breath has many potentially serious causes.
If it is sudden, severe or accompanied by chest pain, confusion, fainting or blue-colored lips, seek urgent medical care rather than waiting for a routine appointment.
15. Trouble Sleeping
Sleep problems can occur in people with kidney disease.
Some people experience difficulty sleeping, while others may feel unusually tired during the day.
Itching, muscle cramps, restless sensations and changes associated with advanced kidney disease can all interfere with sleep.
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Institut National du Diabète et des Maladies Digestives et Rénales
However, insomnia is common and is not by itself evidence of kidney disease.
It becomes more meaningful when it appears together with other changes.
16. Unexplained Weight Loss
Unexpected weight loss can happen in advanced kidney disease, particularly when appetite decreases and nausea develops.
If someone is losing weight without intentionally changing their diet or exercise routine, the cause should be investigated.
Weight loss can be associated with many conditions, ranging from digestive problems and thyroid disorders to infections and other illnesses.
Kidney disease is only one possible explanation.
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Institut National du Diabète et des Maladies Digestives et Rénales
17. Changes in Your Blood Pressure
Blood pressure is not something you can see directly, but it is an important clue about kidney health.
High blood pressure can damage the kidneys over time, while kidney disease can also contribute to high blood pressure.
This creates a potentially harmful cycle.
The National Institute of Diabetes and Digestive and Kidney Diseases identifies high blood pressure as one of the major risk factors for chronic kidney disease.
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Institut National du Diabète et des Maladies Digestives et Rénales
Because high blood pressure often causes no obvious symptoms, regular blood pressure checks are important.
The Most Important Thing to Understand
Having one of these symptoms does not mean that you have kidney disease.
Many of the signs listed above are common and can be caused by other health conditions.
The bigger issue is that early chronic kidney disease frequently causes no symptoms at all.
That is why relying only on how you feel is not enough.
Testing can detect kidney problems before obvious symptoms appear.
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Institut National du Diabète et des Maladies Digestives et Rénales
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Who Should Be Especially Careful?
Certain people have a higher risk of developing chronic kidney disease.
Important risk factors include:
Diabetes
High blood pressure
Heart disease
A family history of kidney failure or kidney disease
Older age
People with these risk factors should discuss kidney screening with their healthcare professional.
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Institut National du Diabète et des Maladies Digestives et Rénales
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Someone can feel completely healthy and still have reduced kidney function.
That is one of the reasons kidney disease is often described as a “silent” condition.
How Are Kidney Problems Detected?
Doctors commonly use blood and urine testing to evaluate kidney health.
A blood test can be used to estimate how well the kidneys are filtering blood, while urine testing can look for albumin and other abnormalities.
The estimated glomerular filtration rate, commonly called eGFR, is one important measure of kidney function.
Urine albumin testing can also provide valuable information about kidney damage.
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Institut National du Diabète et des Maladies Digestives et Rénales
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These tests can be especially important for people with diabetes or high blood pressure.
When Should You Seek Medical Attention?
Some symptoms deserve prompt evaluation.
Contact a healthcare professional if you repeatedly notice:
Foamy urine
Blood in your urine
Persistent swelling
Major changes in how often you urinate
Unexplained fatigue
Persistent itching
Unexplained weight loss
Ongoing nausea or loss of appetite
A sudden major decrease in urine output, severe shortness of breath, chest pain, confusion, or severe weakness can require urgent medical attention, depending on the circumstances. Acute kidney injury can sometimes develop quickly and may need immediate evaluation.
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National Kidney Foundation
Protecting Your Kidneys
There are practical steps that can help reduce the risk of kidney disease or slow progression when kidney disease is already present.
Controlling blood pressure is especially important.
For people with diabetes, keeping blood glucose within the target range recommended by their healthcare team is also important.
Other healthy habits include staying physically active, maintaining a healthy weight, avoiding smoking and taking prescribed medications as directed.
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Institut National du Diabète et des Maladies Digestives et Rénales
It is also important to discuss medications and supplements with a healthcare professional, particularly if you already have kidney problems.
Final Thoughts
Your kidneys may not get much attention when they are working normally, but they perform essential jobs every minute of the day.
Small changes in your urine, swelling around your eyes or ankles, persistent itching, unusual fatigue and changes in urination can sometimes be clues that something needs to be checked.
Among these signs, persistent foamy urine deserves particular attention because it can be associated with protein leaking into the urine. But even this sign does not prove that kidney disease is present.
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National Kidney Foundation
Most importantly, don't wait for symptoms before thinking about kidney health if you have major risk factors such as diabetes, high blood pressure, heart disease or a family history of kidney failure.
Early kidney disease often has no symptoms, which is why appropriate blood and urine testing can be so important.
Your body can sometimes give you clues—but when it comes to kidney health, testing is far more reliable than symptoms alone.
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you have concerning symptoms or risk factors for kidney disease, speak with a qualified healthcare professio
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