The kidneys are remarkable organs that work around the clock to filter waste products, regulate fluid balance, maintain healthy blood pressure, and support the production of red blood cells. Because they perform so many essential functions, problems affecting the kidneys can sometimes cause symptoms in unexpected parts of the body including the feet.

Many people think kidney disease only causes changes in urination. While changes in urine can certainly occur, kidney disease may also contribute to swelling, skin changes, nerve symptoms, and muscle problems that affect the feet and lower legs, particularly in more advanced stages.

It's important to remember that foot symptoms are not specific to kidney disease. They can also result from diabetes, poor circulation, heart disease, nerve disorders, injuries, or many other conditions. Nevertheless, persistent or unexplained changes deserve medical evaluation, especially if you have known risk factors for kidney disease.

Here are six foot symptoms that may warrant medical attention.

Why Kidney Health Can Affect the Feet

Healthy kidneys help regulate:

• Fluid balance

• Electrolytes

• Blood pressure

• Red blood cell production

• Waste removal

When kidney function declines, changes in these systems may contribute to symptoms affecting the lower legs and feet.

However, these symptoms alone cannot diagnose kidney disease.

1. Persistent Swelling of the Feet and Ankles

One of the more common symptoms associated with declining kidney function is swelling (edema).

When the kidneys cannot remove excess fluid effectively, fluid may accumulate in the tissues.

People may notice:

• Puffy ankles

• Swollen feet

• Tight shoes that suddenly no longer fit

• Socks leaving deep marks around the ankles

Swelling often becomes more noticeable later in the day.

However, edema may also be caused by:

• Heart disease

• Liver disease

• Venous insufficiency

• Certain medications

• Pregnancy

• Prolonged standing

Persistent swelling should always be evaluated by a healthcare provider.

2. Muscle Cramps

Many people occasionally experience leg or foot cramps.

In individuals with kidney disease, muscle cramps may occur because of:

• Electrolyte imbalances

• Fluid shifts

• Nerve changes

These cramps often occur:

• At night

• During rest

• In the calves or feet

Muscle cramps are also common in healthy individuals after exercise or dehydration, so they are not specific to kidney disease.

3. Persistent Itching

Severe or ongoing itching can sometimes occur in people with advanced chronic kidney disease.

This symptom, called uremic pruritus, is thought to involve several factors, including:

• Waste product buildup

• Dry skin

• Inflammation

• Changes in nerve signaling

Unlike temporary dry skin, kidney-related itching may:

• Affect large areas of the body

• Be worse at night

• Persist despite moisturizers

Many other conditions—including eczema, allergies, liver disease, and medication side effects—can also cause chronic itching.

4. Numbness or Tingling

Advanced kidney disease may contribute to peripheral neuropathy, a condition affecting the nerves.

Symptoms may include:

• Tingling

• Burning sensations

• Reduced sensation

• "Pins and needles"

• Numbness in the feet

Diabetes remains one of the most common causes of peripheral neuropathy, and because diabetes is also a leading cause of kidney disease, the two conditions often occur together.

Any persistent numbness or weakness should be medically evaluated.

5. Changes in Skin Color or Texture

Kidney disease may sometimes affect the appearance of the skin.

Possible changes include:

• Dry skin

• Pale skin due to anemia

• Darkened areas

• Rough skin texture

These changes usually occur gradually and are not unique to kidney disease.

Good skin care and evaluation of persistent changes are important.

6. Slow-Healing Foot Wounds

Poor wound healing can occur for many reasons.

In people with kidney disease, healing may be affected by:

• Reduced circulation

• Diabetes

• Poor nutrition

• Immune system changes

Foot ulcers deserve prompt medical attention, especially in people with diabetes or known kidney disease.

Ignoring small wounds may increase the risk of infection.

Other Common Symptoms of Kidney Disease

Although foot symptoms may occur, other symptoms are often more closely associated with kidney disease.

These include:

Changes in Urination

You may notice:

• Foamy urine

• Blood in the urine

• Frequent nighttime urination

• Reduced urine output

• Increased urgency

Fatigue

When kidney function declines, anemia may develop because the kidneys produce less erythropoietin, a hormone involved in red blood cell production.

This may contribute to:

• Persistent tiredness

• Weakness

• Reduced exercise tolerance

High Blood Pressure

Kidneys help regulate blood pressure.

High blood pressure can both contribute to kidney disease and result from it.

Regular blood pressure monitoring is important.

Loss of Appetite

Advanced kidney disease may cause:

• Nausea

• Reduced appetite

• Unintended weight loss

These symptoms have many possible causes and require medical evaluation.

Who Is at Higher Risk for Kidney Disease?

Some people are more likely to develop kidney disease, including those with:

• Diabetes

• High blood pressure

• Heart disease

• Obesity

• Family history of kidney disease

• Older age

• Smoking history

If you belong to one of these groups, regular kidney screening may be recommended.

How Is Kidney Disease Diagnosed?

Doctors do not diagnose kidney disease based on foot symptoms alone.

Evaluation typically includes:

• Medical history

• Physical examination

• Blood pressure measurement

• Blood tests (including serum creatinine and estimated glomerular filtration rate, or eGFR)

• Urinalysis

• Urine albumin testing

• Kidney imaging, such as ultrasound, when indicated

These tests provide a much more accurate assessment of kidney function than symptoms alone.

Common Myths About Kidney Disease

Myth: Swollen feet always mean kidney disease.

Fact: Swelling has many possible causes, including heart disease, venous insufficiency, liver disease, medications, pregnancy, and prolonged standing.

Myth: If your urine looks normal, your kidneys are healthy.

Fact: Early kidney disease often causes no obvious symptoms, and urine may appear normal despite reduced kidney function.

Myth: Kidney disease always causes pain.

Fact: Chronic kidney disease frequently develops without pain, especially in its early stages.

Myth: Drinking excessive amounts of water can prevent kidney disease.

Fact: Staying hydrated supports overall health, but excessive water intake does not prevent kidney disease and may not be appropriate for people with certain medical conditions.

Myth: Foot numbness always means kidney problems.

Fact: Diabetes, vitamin deficiencies, nerve disorders, and spinal conditions are among the many possible causes of numbness.

Healthy Habits That Support Kidney Health

While not all kidney disease can be prevented, several habits may help protect kidney function:

• Control blood pressure.

• Manage diabetes carefully.

• Stay physically active.

• Eat a balanced diet rich in fruits, vegetables, whole grains, and legumes.

• Limit excess sodium.

• Avoid smoking.

• Maintain a healthy weight.

• Follow medication instructions and avoid unnecessary use of certain pain relievers unless advised by your healthcare provider.

Routine health checkups are especially important for people with risk factors.

When Should You Seek Medical Care?

See a healthcare provider if you experience:

• Persistent swelling of the feet or ankles

• Blood in the urine

• Foamy urine

• Significant changes in urination

• Ongoing numbness or tingling

• Slow-healing foot wounds

• Persistent fatigue

• High blood pressure that is difficult to control

Seek urgent medical care if swelling develops suddenly, is accompanied by chest pain or difficulty breathing, or if you experience severe weakness or confusion.

The Bottom Line

Your feet can sometimes provide clues about your overall health, including conditions that affect the kidneys. Symptoms such as persistent swelling, muscle cramps, itching, numbness, skin changes, or slow-healing wounds may occur in some people with kidney disease, particularly in more advanced stages. However, these symptoms are not specific to kidney disease and are much more commonly caused by other conditions, including diabetes, heart disease, poor circulation, nerve disorders, or skin conditions.

Rather than relying on symptoms alone, the best way to protect your kidneys is through regular medical checkups, especially if you have diabetes, high blood pressure, or a family history of kidney disease. Early detection through blood and urine tests allows kidney disease to be identified and managed before serious complications develop, helping preserve kidney function and support long-term health.