Swollen Ankles and Feet: Could It Be Your Kidneys?

Swollen ankles, feet, or legs can sometimes be related to kidney disease, but swelling does not automatically mean that your kidneys are failing. There are several possible causes, and understanding where the swelling occurs, whether it affects one or both legs, and when it appears can help identify the underlying problem.

Swelling, also called ‘edema,’ occurs when excess fluid collects in the tissues. Your symptoms, medical history, physical examination, bloodwork, and urine testing can help determine whether your kidneys are contributing to the swelling.

Can Kidney Disease Cause Swelling?

Yes, kidney disease can cause swelling when the kidneys are no longer able to remove enough sodium and water from the body. As fluid builds up, you may notice swelling in your feet, ankles, legs, or other areas of the body. This is more common with advanced kidney disease or kidney failure.

Another kidney-related cause is nephrotic syndrome. In this condition, damaged kidney filters allow large amounts of protein to leak into the urine. When protein levels in the blood become too low, significant swelling can develop. It may affect the legs and feet and can sometimes occur around the eyes or abdomen.

If you are experiencing swelling along with changes in urination, it is important to determine whether kidney-related fluid retention or another condition is responsible. Our protein-leaking into the urine services can help identify abnormal protein loss that may contribute to edema.

What Else Can Cause Swollen Legs and Ankles?

Kidney disease is only one possible explanation for swollen legs and ankles. Other conditions can cause edema or swelling through different mechanisms.

Common causes include:

• Heart failure: This can cause fluid buildup in both legs and may also be associated with fluid around the lungs and shortness of breath.
• Chronic venous insufficiency: When blood does not return efficiently from the legs to the heart, swelling can develop because of a circulation problem rather than overall fluid overload.
• Lymphedema: Impaired lymphatic drainage can cause chronic swelling that does not usually improve with fluid pills or diuretics.
• Deep vein thrombosis (DVT): A blood clot can cause swelling, often affecting one leg.
• Hypothyroidism: An underactive thyroid can sometimes cause puffiness or swelling.
• Medications and other medical conditions: Certain medications and health conditions can also contribute to swelling.

Because there are many possible causes of swollen legs and ankles, it is important not to assume that swelling is caused by your kidneys without an appropriate evaluation.

When Should Swelling Be Evaluated?

New, persistent, or worsening swelling deserves medical attention, particularly when it occurs with other symptoms. You should discuss your symptoms with a healthcare provider if you experience:

• Decreased urine output
• Foamy urine, which may indicate excess protein in the urine
• Shortness of breath
• Rapid or unexplained weight gain
• Significant swelling around the eyes or abdomen
• Swelling that continues or becomes worse over time
• Swelling that primarily affects one leg

Foamy urine can sometimes be associated with protein loss through damaged kidney filters. If you are concerned about foamy urine and protein in the urine, appropriate urine testing can help determine whether kidney disease is involved.

Sudden one-sided leg swelling, chest pain, severe shortness of breath, or difficulty breathing requires urgent medical evaluation, as these symptoms can indicate a serious condition such as a blood clot.

How Do Doctors Determine If Your Kidneys Are Involved?

Your doctor may evaluate the following:

• Symptoms and medical history: Medications, existing conditions, and when the swelling occurs.
• Physical examination: To identify signs of fluid retention or circulation problems.
• Blood and urine tests: To check kidney function and protein levels.
• Blood pressure and fluid balance: To identify factors that may contribute to swelling.

At East Texas Kidney Specialists, we evaluate kidney-related swelling through our broader kidney and fluid care services, including sodium and fluid balance problems. Understanding your test results can also help you see how your kidney function fits into the bigger picture.

What Happens When the Kidneys Can No Longer Remove Enough Fluid?

When kidney function becomes severely reduced, the kidneys may have difficulty maintaining the body’s fluid and electrolyte balance. This can lead to increasing swelling, changes in urine output, weight gain, and other complications.

In advanced kidney disease, your nephrologist may discuss different treatment options based on your kidney function and overall health. In some cases, dialysis may become necessary when the kidneys can no longer adequately remove waste and excess fluid. You can learn more about when kidneys can no longer remove fluid and the treatment options available.

However, swelling alone does not mean that dialysis or advanced kidney treatment is necessary. The underlying cause, severity of kidney dysfunction, and your overall health all need to be considered.

The Bottom Line

Swollen ankles and feet can be caused by kidney disease, but they can also result from heart conditions, circulation problems, lymphatic disorders, medications, and other health conditions. The important question is not simply whether swelling means kidney failure, but why you are swelling.

If you have persistent swelling or other symptoms that concern you, a proper evaluation can help identify the cause and determine whether your kidneys are involved. If you need a kidney evaluation, talk with a nephrologist in Longview to discuss your symptoms and next steps.
East Texas Kidney Specialists provides evaluation and treatment of kidney disease and related fluid and electrolyte disorders in East Texas.