7 Signs Your Kidneys May Be Struggling — Warning Signals You Shouldn’t Ignore

Your kidneys work quietly in the background every day, filtering waste from your blood, removing excess fluid, balancing electrolytes, helping regulate blood pressure, and supporting red blood cell production. Because they perform so many essential functions, kidney problems can eventually affect many parts of the body.

The tricky part is that kidney disease can develop gradually, sometimes without obvious symptoms in the early stages. By the time noticeable changes appear, kidney function may already be significantly reduced.

The image highlights seven supposed signs that your kidneys are “failing and crying for help.” While the wording is dramatic, there is an important medical message underneath it: certain changes in urination, swelling, skin, energy levels, and overall health can occur when kidney function declines.

However, none of these signs alone proves that your kidneys are failing. Many have other possible causes.

Here are seven symptoms worth understanding.

1. Changes in How Often You Urinate

One of the most noticeable changes associated with kidney problems can be a change in urination.

Some people with kidney disease may experience more frequent urination, particularly at night. This can happen because damaged kidneys may have difficulty concentrating urine effectively.

Others, particularly people with more advanced kidney dysfunction or acute kidney injury, may produce much less urine.

You might notice:

• Urinating more often than usual
• Waking several times during the night to urinate
• Producing unusually large or small amounts of urine
• Difficulty urinating
• A noticeable change from your normal urinary pattern

But frequent urination is not automatically a kidney problem. Diabetes, urinary tract infections, prostate enlargement, pregnancy, excessive fluid intake, caffeine, and certain medications can all change urination.

A persistent or unexplained change deserves attention, especially when other symptoms appear at the same time.

2. Foamy or Bubbly Urine

Seeing a few bubbles in the toilet occasionally is completely normal. Urine can become temporarily bubbly simply because of the force with which it hits the water.

Persistent foamy urine, however, can sometimes indicate that protein is leaking into the urine.

Healthy kidneys normally prevent significant amounts of protein from passing through their filtration system. Damage to the kidney's filtering units, known as glomeruli, can allow albumin and other proteins to enter the urine.

This condition is called albuminuria or proteinuria.

Persistent protein in the urine can be an important marker of kidney disease, including kidney damage associated with diabetes and high blood pressure.

If you repeatedly notice unusually foamy urine, particularly if it is accompanied by swelling around the eyes, ankles, or feet, talk with a healthcare professional.

A simple urine albumin-to-creatinine ratio (UACR) can help determine whether abnormal amounts of albumin are present.

3. Swelling Around the Ankles, Feet, or Eyes

Kidneys help regulate the body's balance of sodium and water.

When kidney function becomes impaired, the body may retain excess sodium and fluid. This can contribute to edema, or swelling in body tissues.

Swelling may become noticeable around:

The ankles and feet

The lower legs

The hands

The area around the eyes, particularly in the morning

The exact pattern depends on the underlying condition.

However, swelling is not specific to kidney disease. Heart problems, liver disease, venous insufficiency, medications, pregnancy, and prolonged standing can also cause edema.

Sudden or severe swelling—especially when accompanied by shortness of breath, chest discomfort, or rapid weight gain—requires prompt medical attention.

4. Persistent Fatigue and Weakness

Feeling tired after a stressful week or a poor night's sleep is normal.

Persistent, unexplained fatigue is different.

Advanced chronic kidney disease can contribute to anemia, partly because damaged kidneys may produce less erythropoietin, a hormone involved in stimulating red blood cell production.

Anemia can reduce the body's oxygen-carrying capacity and contribute to:

• Fatigue
• Weakness
• Reduced exercise tolerance
• Dizziness
• Difficulty concentrating
• Shortness of breath during activity

Kidney disease isn't the only explanation for these symptoms. Iron deficiency, thyroid disorders, sleep problems, infections, nutritional deficiencies, and many other conditions can cause fatigue.

Still, unexplained fatigue combined with changes in urination or swelling is worth discussing with a doctor.

5. Persistent Itching or Very Dry Skin

People with advanced kidney disease can develop dry, itchy skin, sometimes called uremic pruritus.

The exact mechanisms are complex. Changes in mineral metabolism, inflammation, nerve signaling, and the accumulation of substances normally regulated by the kidneys may all contribute.

The itching can sometimes be widespread and may become particularly bothersome at night.

But here's the important distinction:

Itchy skin does not automatically mean kidney failure.

Dry weather, eczema, allergies, medications, liver disorders, thyroid problems, and many dermatological conditions can produce similar symptoms.

If itching is persistent, widespread, unexplained, or severe enough to interfere with sleep, medical evaluation can help identify the cause.

6. Nausea, Poor Appetite, or an Unpleasant Taste

When kidney function becomes severely reduced, waste products can accumulate in the bloodstream. This condition is associated with uremia.

Uremia can produce a range of symptoms, including:

• Nausea
• Vomiting
• Poor appetite
• An unpleasant or metallic taste
• Food tasting different
• Weight loss
• General weakness

These symptoms are particularly concerning when they occur alongside other signs of significant kidney dysfunction.

However, nausea and appetite changes are extremely nonspecific. Gastrointestinal infections, medications, pregnancy, liver disease, anxiety, food poisoning, and countless other conditions can cause them.

If these symptoms are persistent or accompanied by significant changes in urination, swelling, confusion, or severe weakness, seek medical advice.