6 WARNING SIGNS YOUR KIDNEYS MAY BE STRUGGLING

Your kidneys work quietly around the clock, filtering waste and excess fluid from your blood, balancing important minerals, helping regulate blood pressure, and supporting red blood cell production. Because the kidneys can compensate for declining function for a long time, kidney disease may develop with few noticeable symptoms in its early stages.

This is why kidney problems are sometimes called “silent.” Symptoms such as swelling, changes in urination, fatigue, or loss of appetite may not appear until kidney function has declined significantly. These symptoms can also have many other causes, so they cannot diagnose kidney disease on their own.

Knowing what to watch for—and getting appropriate blood and urine tests when necessary—can help detect kidney problems earlier.

What Happens When Your Kidneys Aren't Working Properly?

Healthy kidneys continuously filter your blood. They remove waste products and excess water, which leave the body through urine.

Your kidneys also help:

• Balance sodium, potassium, and other electrolytes.
• Regulate blood pressure.
• Maintain healthy bones.
• Control the body's fluid balance.
• Produce hormones involved in making red blood cells.

When kidney function declines, waste products and excess fluid may gradually accumulate. Changes in mineral balance and hormone production can also affect other parts of the body.

Chronic kidney disease, or CKD, usually develops gradually and can eventually lead to serious complications if it progresses.

1. Your Feet and Ankles Become Swollen

Persistent swelling in the feet and ankles can occur when the kidneys have difficulty maintaining normal sodium and fluid balance.

Extra fluid may collect in tissues, particularly in the lower legs because of gravity.

You may notice:

• Shoes becoming tighter.
• Socks leaving deeper marks around your ankles.
• Puffiness in both feet.
• Swelling that becomes more noticeable later in the day.

However, swollen feet are not specific to kidney disease. Heart problems, liver disease, vein disorders, medications, and prolonged sitting can also cause swelling.

New or persistent swelling deserves medical evaluation rather than being assumed to be a kidney problem.

2. You Notice Changes in How Often You Urinate

Changes in urination can sometimes occur when kidney function is affected.

Depending on the underlying problem, you might notice:

• Urinating more frequently.
• Getting up repeatedly at night to urinate.
• Producing less urine than usual.
• Changes in urine appearance.

However, urinary changes can also result from diabetes, urinary tract infections, prostate problems, medications, or simply drinking more or less fluid.

A persistent change from your normal pattern is more important than any specific number of bathroom visits.

3. Your Urine Looks Unusually Foamy

Seeing a few bubbles in the toilet isn't necessarily concerning. Urine can foam simply because it hits the water quickly.

However, persistent or excessive foaminess can sometimes indicate protein in the urine, known medically as proteinuria.

Healthy kidneys normally keep important proteins in the bloodstream. When the kidney's filtering structures become damaged, proteins such as albumin may leak into the urine.

Protein in the urine can be detected with a simple urine test and may be an early sign of kidney damage—even before obvious symptoms develop.

If your urine repeatedly appears unusually foamy, mention it to your healthcare provider.

4. You Feel Tired Even After Getting Enough Rest

Persistent fatigue can occur with more advanced kidney disease for several reasons.

When kidney function becomes significantly impaired, waste products may accumulate in the bloodstream. Kidney disease can also contribute to anemia, a condition in which the body doesn't have enough healthy red blood cells to carry oxygen efficiently.

You might experience:

• Low energy.
• Weakness.
• Difficulty concentrating.
• Reduced exercise tolerance.
• Shortness of breath during activity.

Fatigue is extremely common and has many other possible causes, including poor sleep, iron deficiency, thyroid problems, infections, and certain medications.

If unexplained fatigue persists, medical evaluation can help determine the cause.

5. Your Skin Becomes Unusually Dry or Itchy

Your kidneys help regulate minerals and other substances in the bloodstream.

In more advanced kidney disease, disturbances in mineral metabolism and the accumulation of substances normally removed by the kidneys may contribute to persistent itching.

Some people experience:

• Very dry skin.
• Persistent itching without an obvious rash.
• Itching that interferes with sleep.
• Symptoms affecting large areas of the body.

Dry or itchy skin alone is much more commonly caused by ordinary skin conditions, allergies, weather, or aging.

However, persistent unexplained itching combined with other possible kidney symptoms should be discussed with a healthcare professional.

6. You Lose Your Appetite or Feel Nauseated

Loss of appetite and nausea can occur when kidney disease becomes more advanced.

As kidney function declines significantly, waste products that would normally be removed through urine can accumulate in the bloodstream. This condition is known as uremia.

It may contribute to:

• Reduced appetite.
• Nausea.
• Changes in how food tastes.
• Unintentional weight loss.
• Vomiting in severe cases.

These symptoms have many possible causes and aren't specific to kidney disease. Persistent nausea or unexplained loss of appetite should therefore be medically evaluated.

Kidney Disease Can Be Silent

One of the most important facts about chronic kidney disease is that you may feel completely normal during its early stages.

Waiting for symptoms isn't a reliable way to determine whether your kidneys are healthy.

Two commonly used tests can help detect kidney problems:

Blood Test

A blood test measures creatinine and is used to estimate the glomerular filtration rate (eGFR), an indicator of how effectively the kidneys are filtering blood.

Urine Test

A urine albumin-to-creatinine ratio (UACR) checks whether abnormal amounts of albumin are leaking into the urine.

These tests are particularly important for people at increased risk of kidney disease.

Who Is Most at Risk?

Kidney screening may be especially important if you:

• Have diabetes.
• Have high blood pressure.
• Have cardiovascular disease.
• Have a family history of kidney disease.
• Have previously experienced kidney injury.
• Take medications that can affect kidney function.
• Are older and have additional kidney disease risk factors.

Diabetes and high blood pressure are particularly important because both can gradually damage the kidneys' small blood vessels.

How to Help Protect Your Kidneys

There is no special “kidney detox” needed for healthy kidneys. Instead, focus on habits that protect kidney function over the long term.

Helpful strategies include:

• Keep blood pressure well controlled.
• Manage blood sugar if you have diabetes.
• Stay physically active.
• Eat a balanced diet with plenty of minimally processed foods.
• Avoid excessive sodium.
• Don't smoke.
• Stay appropriately hydrated.
• Maintain a healthy body weight.
• Take medications exactly as directed.

Be especially careful with frequent or excessive use of nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen and naproxen. These medicines can contribute to kidney injury in some people, particularly those who already have kidney problems or other risk factors.

Avoid starting supplements or herbal “kidney cleanses” without discussing them with a healthcare professional.

When Should You See a Doctor?

Arrange a medical evaluation if you develop persistent:

• Swelling in your feet or ankles.
• Changes in urination.
• Very foamy urine.
• Unexplained fatigue.
• Severe or persistent itching.
• Loss of appetite or nausea.

Your healthcare provider may recommend blood pressure measurement, blood tests, and urine testing depending on your symptoms and risk factors.

Seek urgent medical attention if you suddenly produce very little or no urine, develop severe shortness of breath with swelling, become confused, have persistent vomiting, or experience other rapidly worsening symptoms.

Key Takeaways

• Chronic kidney disease can progress without obvious early symptoms.
• Swollen feet and ankles may occur when the body retains excess sodium and fluid.
• Persistent foamy urine can sometimes indicate protein leaking into the urine.
• Fatigue, itching, nausea, and loss of appetite are more commonly associated with advanced kidney dysfunction than early disease.
• Symptoms alone cannot diagnose kidney disease because many other conditions can cause the same problems.
• Blood and urine tests are among the most useful ways to identify kidney damage and reduced kidney function.
• People with diabetes, high blood pressure, or other risk factors should discuss appropriate kidney screening with their healthcare provider.

Medical Disclaimer

This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Kidney disease often causes few symptoms in its early stages, and the symptoms described above can have many other causes. If you are concerned about your kidney health or have persistent symptoms, consult a qualified healthcare professional for appropriate blood and urine testing.