Your kidneys may not get as much attention as your heart or brain, but these two small organs perform some of the body’s most important everyday jobs.
Located toward the back of the abdomen, the kidneys continuously filter the blood, removing waste and excess fluid that eventually leave the body as urine. They also help regulate blood pressure, maintain the right balance of minerals and electrolytes, support red blood cell production, and contribute to healthy bones.
The challenge is that kidney problems can develop quietly. Early chronic kidney disease may cause few noticeable symptoms, and some people don’t realize anything is wrong until kidney function has declined significantly.
That doesn’t mean every unusual symptom points to kidney disease. Many of the warning signs associated with kidney problems can also occur with far more common conditions. Still, recognizing potential changes—and knowing when to discuss them with a healthcare professional—can make a meaningful difference.
Here are seven signs that your kidneys may deserve more attention.
1. You’re Urinating More Often Than Usual
A noticeable change in bathroom habits is worth paying attention to, especially if it persists without an obvious explanation.
The kidneys produce urine as they filter waste and excess water from the blood. Certain kidney problems can affect this process, potentially changing how frequently you urinate or how much urine you produce.
Some people may notice that they need to get up several times during the night to use the bathroom. Others may experience changes in urine volume.
However, frequent urination doesn’t automatically mean you have kidney disease. Drinking more fluids, consuming caffeine, taking certain medications, diabetes, urinary tract problems, and prostate conditions can also increase urinary frequency.
If your bathroom habits have changed significantly and you don’t know why, consider discussing the change with your doctor.
2. Your Urine Looks Foamy or Unusually Bubbly
Everyone sees bubbles in the toilet occasionally. A strong urine stream can create temporary bubbles, so seeing them once isn’t necessarily concerning.
Persistent or unusually foamy urine can be different.
One possible explanation is excess protein in the urine, known as proteinuria. Healthy kidneys generally prevent significant amounts of protein from escaping from the blood into urine. When the kidneys’ filtering structures are damaged, however, protein may leak through.
Urine that repeatedly appears very foamy—particularly if accompanied by swelling or other symptoms—may warrant a medical evaluation.
A simple urine test can help determine whether abnormal levels of protein are present.
3. Your Ankles, Feet, or Legs Are Swollen
Swelling in the lower body can have many causes, from sitting for extended periods to certain heart, liver, vein, or medication-related problems.
Kidney problems are another possibility.
When the kidneys aren’t removing excess sodium and fluid efficiently, fluid may accumulate in the body’s tissues. This can sometimes produce noticeable swelling, particularly around the feet, ankles, and lower legs.
Some kidney conditions that cause protein loss in the urine can also contribute to swelling.
Occasional mild swelling after a long day isn’t necessarily a warning sign. Persistent, unexplained, worsening, or sudden swelling deserves more attention.
Sudden swelling accompanied by difficulty breathing, chest pain, or other severe symptoms requires prompt medical care.
4. You’re More Tired Than You Used to Be
Fatigue is extremely common, and kidney disease is far from the only potential explanation. Poor sleep, stress, anemia, infections, nutritional deficiencies, medications, and numerous medical conditions can leave you feeling exhausted.
But persistent fatigue can sometimes occur when kidney function declines.
Healthy kidneys help the body remove waste products from the blood. As kidney function worsens, waste can accumulate and contribute to weakness, difficulty concentrating, or fatigue.
The kidneys also produce a hormone involved in making red blood cells. Advanced kidney disease can interfere with this process and contribute to anemia, which may further increase tiredness and weakness.
If you’re consistently exhausted despite getting enough sleep, especially when the fatigue is new or worsening, it’s worth discussing with a healthcare professional.
5. You’ve Noticed Blood in Your Urine
Blood in the urine should not be ignored.
Urine containing visible blood may appear pink, red, or brown. In other cases, the amount of blood is so small that it can only be detected during a laboratory urine test.
Kidney disease is one possible cause, but there are many others. Urinary tract infections, kidney stones, prostate problems, vigorous exercise, certain medications, and conditions affecting the bladder or urinary tract can potentially cause blood in the urine.
Because the causes range from relatively minor to serious, unexplained blood in the urine should be medically evaluated rather than self-diagnosed.
6. You’re Experiencing Persistent Itching or Dry Skin
An occasional itch is usually nothing to worry about. Dry weather, soaps, allergies, and numerous skin conditions are much more common explanations than kidney disease.
Persistent or severe itching, however, can sometimes occur in people with advanced chronic kidney disease.
The kidneys play an important role in maintaining the body’s balance of minerals and removing waste. When kidney function becomes severely impaired, changes in these processes can contribute to skin problems and itching.
Dry or itchy skin by itself isn’t enough to conclude that something is wrong with your kidneys. But if it is persistent, unexplained, or accompanied by swelling, fatigue, urinary changes, or other symptoms, mention it to your healthcare provider.
7. Your Blood Pressure Is Consistently High
High blood pressure and kidney disease have a particularly important relationship: each can contribute to the other.
Over time, uncontrolled high blood pressure can damage blood vessels throughout the body, including the tiny vessels involved in kidney filtration. At the same time, damaged kidneys can have difficulty regulating fluid and hormones involved in blood pressure control.
This can create a cycle in which kidney problems and hypertension make one another worse.
High blood pressure usually doesn’t cause obvious symptoms, which is why regular blood pressure checks are so important—particularly as you get older or if you have other risk factors for kidney disease.
If your readings are repeatedly above the range recommended by your healthcare provider, don’t simply assume it’s a normal part of aging.
Who Is More Likely to Develop Kidney Disease?
Anyone can experience kidney problems, but certain factors can increase the likelihood of chronic kidney disease.
Two of the most important are diabetes and high blood pressure. People with heart disease or a family history of kidney failure may also face greater risk. Risk can also increase with age.
Because early kidney disease frequently produces few symptoms, people with higher risk shouldn’t necessarily wait for warning signs before discussing kidney health with their doctor.
Routine blood and urine tests can provide valuable information about how well the kidneys are functioning.
How Doctors Check Kidney Function
Fortunately, checking kidney health usually doesn’t require complicated testing.
A healthcare professional may order a blood test that measures creatinine, a waste product normally filtered by the kidneys. That information can be used to estimate the glomerular filtration rate (eGFR), an important measure of kidney function.
A urine test may also measure albumin, a type of protein. Elevated albumin in the urine can be an early indication that the kidneys’ filtering system has been damaged.
Blood pressure measurements are also an important part of assessing kidney health.
Depending on the results and a person’s medical history, additional testing may sometimes be recommended.
Everyday Habits That Can Help Protect Your Kidneys
Kidney health is closely connected to overall health, so many of the same habits that protect your heart and blood vessels can benefit your kidneys.
Keeping blood pressure and blood sugar within your healthcare provider’s recommended ranges is especially important. Regular physical activity, maintaining a healthy weight, avoiding tobacco, getting adequate sleep, and eating a balanced diet can also support overall health.
Be cautious about assuming that more water is always better. Most healthy people should stay adequately hydrated, but individual fluid requirements vary. People with certain kidney or heart conditions may actually need to limit fluids under medical supervision.
Medication use matters as well. Some over-the-counter medicines, including nonsteroidal anti-inflammatory drugs (NSAIDs), can potentially harm the kidneys when used excessively or in certain higher-risk individuals. Follow label directions and ask your doctor or pharmacist about long-term use if you have kidney disease or other medical conditions.
“Kidney detoxes,” cleanses, and unproven supplements aren’t substitutes for medical care. Some supplements can even contain ingredients that may be harmful to the kidneys.
When Should You Talk to a Doctor?
One symptom on this list doesn’t necessarily mean you have kidney disease. Fatigue, swelling, frequent urination, and itchy skin can have many different explanations.
What matters most is whether symptoms are persistent, unexplained, worsening, or occurring together.
You may also want to ask about kidney testing even if you feel perfectly healthy when you have major risk factors such as diabetes, high blood pressure, heart disease, or a family history of kidney failure.
Seek prompt medical attention for potentially serious symptoms such as visible blood in the urine, severe or rapidly developing swelling, major changes in urine production, difficulty breathing, chest pain, confusion, or other sudden and severe symptoms.
The Bottom Line
Your kidneys work around the clock, usually without attracting much attention. That’s exactly why kidney health can be easy to overlook.
Changes in urination, persistently foamy urine, swelling, unusual fatigue, blood in the urine, unexplained itching, and high blood pressure can sometimes signal that the kidneys need closer evaluation. None of these symptoms proves that kidney disease is present, but persistent changes shouldn’t simply be dismissed.
Perhaps most importantly, don’t wait for symptoms if you’re at increased risk. Kidney disease can remain silent during its earlier stages, and straightforward blood and urine tests can help identify potential problems.
Paying attention to your blood pressure, managing conditions such as diabetes, using medications appropriately, and keeping up with routine medical care are practical steps that can help protect kidney health for years to come.
This article is for general informational and educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. It is not a substitute for personalized medical advice. Speak with a qualified healthcare professional if you have concerns about your kidney health or symptoms.
