10 Signs of Kidney Disease You Shouldn’t Ignore

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Early chronic kidney disease (CKD) often has no noticeable symptoms. You may feel well and urinate normally while a blood or urine test shows a problem. That is why waiting for pain or another obvious sign is an unreliable way to check your kidneys.

The ten findings below include test results and physical changes worth discussing with a healthcare professional. They are not a checklist for diagnosing yourself. Some symptoms have common causes unrelated to the kidneys; others may appear only when kidney disease is more advanced.

For general ideas about everyday kidney health habits, you can explore the Kidney Coach program. If you have a new symptom or abnormal result, ask a healthcare professional what it means for you.

1. Albumin or protein in your urine test

One of the earliest detectable signs of kidney damage may be albumin in the urine, even when you feel fine. Healthy kidney filters usually keep most albumin in the blood.

A urine albumin-to-creatinine ratio (uACR) helps measure how much albumin is passing into urine. A result above the expected range may need repeat testing and an assessment of the cause. Do not rely on how urine looks to decide whether albumin is present.

If you have diabetes or high blood pressure, ask whether you have had a uACR test and when it should be repeated.

2. A lower eGFR on a blood test

Estimated glomerular filtration rate (eGFR) is calculated using a blood measurement, commonly creatinine. It estimates how well your kidneys filter blood.

One low result does not automatically establish long-standing CKD. Your clinician considers earlier results, repeat tests, urine albumin, and whether you were ill when the sample was taken. A sudden drop needs timely assessment because it may indicate an acute problem.

For more on interpreting changes, read can low GFR be reversed?.

3. High blood pressure

High blood pressure can contribute to kidney damage, and kidney disease can also make blood pressure harder to control. Many people with high blood pressure feel no different, so measuring it matters.

A high reading does not prove you have CKD. If your blood pressure is repeatedly above the goal set for you, ask about kidney testing and a treatment plan.

Read our guide to the connection between high blood pressure and low eGFR for more detail.

4. Persistent foamy urine

A few bubbles after urinating are common. Foam that repeatedly appears and takes time to disappear is worth mentioning to a clinician because it can sometimes occur with protein in the urine.

Appearance alone cannot tell you whether the foam contains protein. A urine test is needed. Tell your clinician if you also notice swelling around your eyes or ankles.

5. Blood in your urine

Urine that looks pink, red, or brown needs assessment. Blood in the urine can have several causes, including infection, stones, and conditions affecting the kidney filters.

Do not assume it is harmless because it happened only once, or that it necessarily means CKD. A clinician can check whether blood is present and investigate the cause.

If blood in the urine comes with fever, severe pain, or difficulty passing urine, seek prompt medical care.

If you want a structured source of general kidney health education, you can review the Kidney Coach program. Visible blood in urine or a new abnormal test result still needs a medical assessment.

6. Swelling around the eyes, feet, or ankles

New puffiness around the eyes or swelling in the feet and ankles can occur when the body retains fluid or loses protein into urine. It can also have non-kidney causes, including heart conditions and medicines.

Watch for a change from your usual pattern and tell your clinician if it persists or worsens. Swelling with shortness of breath needs urgent assessment.

Do not respond to unexplained swelling by changing prescribed water tablets or sharply altering your fluid intake on your own.

7. A persistent change in urination

You may notice that you urinate more often at night, pass much less urine than usual, or experience another lasting change. These symptoms have many possible causes—including bladder or prostate conditions, diabetes, and medicines—so they do not diagnose CKD.

It is especially important to report a sudden marked reduction in urine output. Tell your clinician when the change began and whether you have fever, pain, swelling, or a recent illness.

Normal-looking urine does not rule out kidney disease. Early CKD can exist without a change you notice.

8. Unusual tiredness or weakness

Fatigue is common and has many causes. As kidney disease progresses, complications such as anemia may contribute to tiredness. Poor sleep, other illnesses, and medicines can also play a role.

If fatigue persists or affects your usual activities, ask for an assessment rather than assuming it is caused by your kidneys—or dismissing it because you have no pain.

A clinician can decide which tests are appropriate based on your full history.

9. Poor appetite, nausea, or an unpleasant taste

Loss of appetite or nausea can occur in more advanced kidney disease, but these are not reliable early signs. Infections, digestive conditions, medicines, and many other problems may also cause them.

Tell your clinician if you are eating much less, losing weight unintentionally, or vomiting. Persistent vomiting deserves prompt attention, especially if you have known CKD or cannot keep fluids down.

10. Persistent itching

Itching can develop for different reasons, including dry skin. In people with more advanced kidney disease, mineral imbalances may also be relevant.

Do not assume itching means your kidneys are failing or immediately cut foods from your diet. If itching persists or disrupts sleep, discuss your skin, medicines, and blood results with your care team.

Which signs are actually “early”?

The most useful early clues are often measurements rather than sensations: urine albumin, eGFR, and blood pressure. Foamy urine or swelling may prompt testing, but many people with early CKD have neither.

Fatigue, poor appetite, nausea, and itching can occur as kidney disease progresses. Including them here helps you know what to report; it does not mean someone with early CKD should expect all ten signs.

Who should ask about kidney testing even without symptoms?

Ask a healthcare professional whether you need kidney testing if you have:

  • Diabetes.
  • High blood pressure.
  • Cardiovascular disease.
  • A family history of kidney failure.
  • A previous episode of acute kidney injury.
  • Another condition your clinician says increases your kidney risk.

The usual discussion includes a blood test for creatinine and eGFR and a urine test for albumin. Your clinician can advise how often to repeat them.

For help reading a blood result, see understanding creatinine levels: what’s normal and when to worry.

When should you seek urgent help?

Seek prompt medical assessment for blood in urine, a marked drop in urine output, rapidly worsening swelling, persistent vomiting, or fever with back or side pain.

Seek emergency care for severe shortness of breath, chest pain, new confusion, fainting, or suddenly being unable to pass urine with significant pain or illness. Follow any urgent instruction from your laboratory or healthcare team even if you feel well.

Frequently asked questions

Can I have kidney disease if I feel healthy?

Yes. Early CKD often causes no noticeable symptoms. Blood and urine testing are important, especially if you have risk factors.

Does foamy urine always mean protein loss?

No. Its appearance cannot confirm the cause. Ask whether a urine albumin test is appropriate if the foam is persistent.

Does kidney disease always cause back pain?

No. CKD often does not cause kidney pain. Back or side pain can have many other causes and needs assessment according to the accompanying symptoms.

Is one low eGFR enough to diagnose CKD?

Usually, no. Your clinician will consider how long the abnormality has been present, repeat results, urine findings, and the possibility of an acute problem.

What are the two most useful tests to ask about?

Ask about eGFR from a blood test and urine albumin, commonly reported as uACR. Your clinician may recommend additional tests based on the results.

The takeaway

The earliest sign of CKD may be a test result, not a symptom. A lower eGFR or albumin in urine can appear before you feel unwell. Persistent foam, blood in urine, swelling, and other changes deserve discussion, but none diagnoses kidney disease by itself.

If you have kidney risk factors, ask about blood and urine testing even when you feel healthy. If you have a sudden or severe change, seek care promptly rather than waiting for a routine appointment.

For additional educational material about everyday kidney health habits, explore the Kidney Coach program. Keep prescribed treatment and testing in place; symptoms and test results need individual medical interpretation.

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