Swollen Feet & Legs: Is It Kidney Disease? Find Out & Get Treated

Why Do Kidneys Cause Swelling?

Swelling (medically called oedema) occurs when excess fluid accumulates in the body's tissues. The kidneys play a central role in fluid balance — they control how much water and salt the body retains or excretes. When kidneys are damaged or diseased, this precise fluid regulation breaks down, leading to fluid retention and swelling.

There are two main mechanisms by which kidney disease causes swelling:

1. Salt and water retention: Diseased kidneys cannot excrete sodium and water normally. Excess sodium draws water into the blood vessels, which then leaks into surrounding tissues — causing swelling, most prominently in the feet, ankles, and legs due to gravity, and in the face (particularly around the eyes) in the morning after lying flat all night.

2. Low blood albumin (in nephrotic syndrome): When damaged kidneys allow large amounts of protein (albumin) to leak into urine, blood albumin levels fall. Albumin is responsible for keeping fluid within blood vessels by oncotic pressure. Without enough albumin, fluid leaks out of blood vessels into surrounding tissues — causing widespread, sometimes massive swelling (face, legs, abdomen).

How to Tell if Swelling is from Kidney Disease

Kidney Conditions That Cause Significant Swelling

1. Nephrotic Syndrome — Most Dramatic Swelling

Characterized by massive protein loss in urine, very low blood albumin, and sometimes dramatic fluid accumulation — the abdomen can swell with litres of fluid (ascites), and the legs can become severely oedematous. Around the eyes (periorbital oedema) is a classic early sign — parents often notice their child's eyes appear puffy each morning.

2. Chronic Kidney Disease (CKD) — Progressive Swelling

In CKD, the kidneys' inability to excrete sodium causes gradual fluid retention. Swelling often starts in the ankles and feet and is worse at the end of the day after standing or sitting. As CKD progresses, swelling becomes more persistent and significant. High blood pressure (which is both a cause and consequence of CKD) further worsens fluid retention.

3. Acute Kidney Injury — Rapid Swelling

In AKI, the sudden loss of kidney function can cause rapid fluid accumulation. Pulmonary oedema (fluid in the lungs) can cause breathlessness and in severe cases can be life-threatening. Leg swelling may develop over hours to days.

4. Dialysis Patients Between Sessions

Dialysis removes excess fluid during each session, but between sessions, fluid accumulates — especially if fluid intake exceeds limits. Dialysis patients need to strictly limit fluid intake between sessions, particularly in Punjab's hot summer when the temptation to drink more is high.

Diagnosing the Cause of Swelling

Dr. Swaranjeet Kaur performs a comprehensive evaluation to determine whether swelling is kidney-related and identify the specific kidney condition:

• Blood tests: creatinine, eGFR, albumin, cholesterol, full blood count
• Urine tests: protein, albumin-creatinine ratio, urine routine and microscopy
• Blood pressure measurement
• Kidney ultrasound
• Echocardiogram to rule out heart failure
• Liver function tests to rule out liver disease

Treatment of Kidney-Related Swelling in Bathinda

• Diuretics (water pills) — Furosemide increases urine output to remove excess fluid. Dr. Swaranjeet Kaur carefully doses diuretics to avoid over-diuresis which can worsen kidney function.
• Sodium restriction — Reducing salt intake to less than 2g/day is essential to prevent fluid re-accumulation
• Treating the underlying kidney disease — Steroids for nephrotic syndrome, ACE inhibitors/ARBs for CKD with proteinuria, dialysis for severe AKI or CKD Stage 5
• Fluid restriction — In advanced CKD or dialysis, limiting daily fluid intake prevents dangerous fluid overload
• Elevation and compression stockings — Helpful adjuncts for peripheral oedema in CKD