5 Early Warning Signs Your Kidneys May Be Failing (Don’t Ignore These)

5 Early Warning Signs Your Kidneys May Be Failing (Don’t Ignore These)

Your kidneys work around the clock to filter waste products from your blood, regulate fluid and electrolyte balance, help control blood pressure, and produce hormones that support healthy red blood cells and strong bones. Despite their vital role, kidney disease often develops silently, with few noticeable symptoms until significant kidney damage has already occurred.

According to health experts, chronic kidney disease (CKD) affects millions of Americans, and many people are unaware they have it. Early recognition of warning signs—combined with routine blood and urine testing for those at risk—can help slow disease progression and reduce the risk of kidney failure.

While these symptoms do not necessarily mean your kidneys are failing, they should not be ignored if they persist or worsen.

Here are five early warning signs that may indicate your kidneys need medical attention.

What Do Your Kidneys Do?

Your kidneys perform several essential functions, including:

Filtering waste products and excess fluid from the blood
Balancing electrolytes such as sodium and potassium
Helping regulate blood pressure
Supporting red blood cell production through the hormone erythropoietin
Activating vitamin D to maintain bone health

When kidney function declines, waste products and fluid can accumulate in the body, leading to a wide range of symptoms.

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1. Swelling in the Feet, Ankles, or Around the Eyes

One of the earliest signs of declining kidney function is fluid retention.

Healthy kidneys help remove excess sodium and water. When they become less effective, fluid may build up in the body.

You may notice:

Swollen ankles
Puffy feet
Swelling in the lower legs
Puffiness around the eyes, especially in the morning
Shoes or rings feeling tighter than usual

However, swelling can also result from heart disease, liver disease, venous insufficiency, or certain medications, so it should always be evaluated by a healthcare professional.

2. Changes in Urination

Because the kidneys produce urine, changes in urination are often among the earliest clues that something may be wrong.

Possible changes include:

Urinating more often, particularly at night
Producing less urine than usual
Foamy or frothy urine, which may indicate excess protein
Blood in the urine
Dark-colored urine
Difficulty urinating

Persistent changes in urination should never be ignored.

3. Persistent Fatigue and Weakness

Healthy kidneys produce erythropoietin, a hormone that stimulates the production of red blood cells.

As kidney function declines, anemia may develop, leading to:

Constant fatigue
Weakness
Reduced exercise tolerance
Difficulty concentrating
Feeling unusually tired after routine activities

Fatigue has many possible causes, but persistent symptoms deserve medical evaluation.

4. Persistent Itchy Skin

As kidney disease progresses, waste products can accumulate in the bloodstream, contributing to persistent itching (pruritus).

The itching may:

Affect large areas of the body
Be worse at night
Occur without an obvious rash
Persist despite using moisturizers

Dry skin is common in older adults, but ongoing severe itching should be discussed with your healthcare provider.

5. Nausea, Poor Appetite, or a Metallic Taste

When waste products build up in the blood, some people experience digestive symptoms such as:

Loss of appetite
Nausea
Vomiting
A metallic taste in the mouth
Bad breath with an ammonia-like odor

These symptoms are more common in advanced kidney disease but can occasionally appear earlier.

Who Is at Higher Risk for Kidney Disease?

Several factors increase the risk of chronic kidney disease, including:

Diabetes
High blood pressure
Heart disease
Obesity
Smoking
Age over 60
Family history of kidney disease
Recurrent kidney infections
Long-term use of certain medications, including some nonsteroidal anti-inflammatory drugs (NSAIDs)

People with these risk factors should discuss routine kidney screening with their healthcare provider.

How Is Kidney Disease Diagnosed?

Early kidney disease often cannot be diagnosed based on symptoms alone.

Healthcare providers commonly use:

Blood Tests

These measure:

Creatinine
Estimated glomerular filtration rate (eGFR)
Electrolytes

These tests help assess how well the kidneys are filtering blood.

Urine Tests

Urine testing can detect:

Protein (albumin)
Blood
Signs of infection

Persistent protein in the urine is an important marker of kidney damage.

Imaging Studies

An ultrasound or CT scan may be recommended to evaluate the size and structure of the kidneys or identify blockages.

Can Kidney Disease Be Slowed?

Although chronic kidney disease is often not completely reversible, early treatment can significantly slow its progression.

Healthy habits include:

Controlling blood pressure
Managing diabetes effectively
Following a balanced diet
Limiting excess sodium
Staying physically active
Maintaining a healthy weight
Avoiding tobacco products
Using medications only as directed
Staying well hydrated unless your healthcare provider recommends otherwise

Treatment plans vary depending on the underlying cause and stage of kidney disease.

When Should You Seek Medical Care?

Schedule an appointment if you notice:

Persistent swelling
Changes in urination
Ongoing fatigue
Foamy or bloody urine
Persistent itching
Loss of appetite
Symptoms lasting more than a few weeks

Routine kidney testing is especially important if you have diabetes or high blood pressure—even if you feel well.

Seek Emergency Medical Attention If You Experience

Call 911 or seek immediate medical care if you develop:

Chest pain
Severe shortness of breath
Confusion
Inability to urinate
Severe swelling with difficulty breathing
Sudden severe weakness or fainting

These symptoms may indicate a medical emergency requiring urgent evaluation.

The Bottom Line

Kidney disease often develops quietly, and many people have no symptoms during its earliest stages. However, swelling, changes in urination, persistent fatigue, itchy skin, and nausea or loss of appetite may signal declining kidney function and should not be ignored.

The most important message is that early detection matters. If you have risk factors such as diabetes or high blood pressure, regular blood and urine tests can identify kidney disease before serious complications develop. Working closely with your healthcare provider to manage underlying conditions and adopt healthy lifestyle habits can help protect your kidneys for years to come.

Medical Disclaimer: This article is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment. If you experience persistent swelling, changes in urination, or other concerning symptoms, consult a qualified healthcare professional promptly. Early evaluation and appropriate treatment can help preserve kidney function and improve long-term health.