23 Possible Warning Signs of Kidney Disease You Should Never Ignore

Your kidneys work around the clock to keep your body healthy. These two bean-shaped organs filter about 50 gallons (190 liters) of blood every day, removing waste products, balancing fluids, regulating blood pressure, producing hormones, and maintaining healthy levels of minerals such as sodium and potassium.

The problem is that kidney disease often develops silently. Many people have no noticeable symptoms until significant kidney function has already been lost. That's why understanding the early warning signs is so important.

The image above highlights several symptoms that are often associated with kidney problems. While none of these signs alone can diagnose kidney disease, persistent or multiple symptoms should prompt a medical evaluation.

Here are 23 possible warning signs that may indicate your kidneys need attention.

1. Persistent Fatigue

Healthy kidneys produce erythropoietin, a hormone that helps make red blood cells. When kidney function declines, anemia can develop, leading to:

• Constant tiredness
• Low energy
• Weakness
• Difficulty concentrating

2. Swelling of the Feet and Ankles

Damaged kidneys may struggle to remove excess salt and fluid, causing swelling in the:

• Feet
• Ankles
• Lower legs
• Sometimes the hands

This symptom is called edema.

3. Puffiness Around the Eyes

Protein leaking into the urine may reduce the body's ability to keep fluid inside blood vessels, leading to swelling around the eyes, especially in the morning.

4. Changes in Urination

Pay attention if you notice:

• Urinating more often
• Urinating less than usual
• Waking frequently at night to urinate
• Difficulty urinating
• Weak urine stream

These changes can have many causes but deserve medical evaluation if persistent.

5. Blood in the Urine

Urine that appears pink, red, or cola-colored may indicate blood.

Possible causes include:

• Kidney stones
• Urinary tract infections
• Kidney disease
• Other urinary tract conditions

6. Foamy or Bubbly Urine

Persistent foamy urine may suggest protein in the urine (proteinuria), an important sign that the kidneys' filtering system may be damaged.

7. High Blood Pressure

The kidneys help regulate blood pressure.

High blood pressure can both:

• Damage the kidneys
• Result from kidney disease

The two conditions often reinforce each other.

8. Persistent Itching

Advanced kidney disease can lead to waste products building up in the bloodstream, contributing to:

• Dry skin
• Persistent itching
• Skin irritation

9. Dry Skin

Kidneys help regulate minerals and support overall skin health.

Dry skin isn't usually caused by kidney disease alone, but when combined with other symptoms, it may warrant further investigation.

10. Muscle Cramps

Kidney disease can disrupt electrolyte balance, increasing the likelihood of muscle cramps, particularly in the legs.

11. Loss of Appetite

A buildup of waste products in the blood can reduce appetite and make eating less appealing.

12. Nausea

People with more advanced kidney disease may experience:

• Nausea
• Upset stomach
• Vomiting

These symptoms occur because toxins accumulate when the kidneys can no longer filter efficiently.

13. Metallic Taste in the Mouth

Some individuals report:

• Food tasting different
• A metallic taste
• Bad breath related to waste buildup (uremic breath)

14. Unexplained Weight Loss

Poor appetite combined with nausea may lead to gradual, unintended weight loss.

15. Difficulty Concentrating

Anemia and waste buildup may reduce oxygen delivery to the brain, causing:

• Brain fog
• Poor memory
• Difficulty focusing

16. Shortness of Breath

This may occur because of:

• Anemia
• Fluid accumulation in the lungs
• Heart complications associated with kidney disease

Shortness of breath should always be evaluated promptly.

17. Persistent Lower Back or Side Pain

Pain near the kidneys—located just below the rib cage on either side of the spine—may occur with:

• Kidney infections
• Kidney stones
• Polycystic kidney disease

However, chronic kidney disease often causes no pain, so the absence of pain does not rule it out.

18. Difficulty Sleeping

People with chronic kidney disease commonly report:

• Insomnia
• Restless legs syndrome
• Frequent nighttime urination
• Sleep apnea

19. Frequent Urinary Tract Infections

Repeated urinary infections may increase the risk of kidney infections if left untreated.

20. Pale Skin

Kidney-related anemia may make the skin appear unusually pale.

21. Persistent Skin Rash

Some people with advanced kidney disease develop skin irritation or rashes due to waste accumulation and severe itching.

22. Easy Bruising

Kidney disease can affect platelet function, making bruising more noticeable in some individuals.

23. General Feeling of Being Unwell

Many people simply report feeling "off," including:

• Low energy
• Poor appetite
• Weakness
• Reduced exercise tolerance

These nonspecific symptoms can occur in many conditions, including kidney disease.

Who Is at Higher Risk?

You may have a higher risk of developing kidney disease if you have:

• Diabetes
• High blood pressure
• Heart disease
• Obesity
• A family history of kidney disease
• A history of kidney stones
• Long-term use of certain pain medications (such as NSAIDs)
• Smoking

Regular checkups are especially important for people in these groups.

How to Protect Your Kidneys

Healthy lifestyle habits can help reduce the risk of kidney damage:

• Control blood pressure.
• Manage blood sugar if you have diabetes.
• Drink enough water unless your doctor advises otherwise.
• Limit excessive salt intake.
• Eat a balanced diet rich in fruits, vegetables, whole grains, and lean proteins.
• Exercise regularly.
• Avoid smoking.
• Limit alcohol consumption.
• Use over-the-counter pain medications only as directed.
• Have routine kidney function tests if you're at increased risk.

When Should You See a Doctor?

Seek medical evaluation if you experience:

• Blood in your urine
• Persistent swelling of the legs or face
• Ongoing foamy urine
• Significant changes in urination
• Severe flank pain with fever
• High blood pressure that's difficult to control
• Persistent fatigue accompanied by other symptoms

A healthcare provider may recommend blood tests (such as creatinine and estimated glomerular filtration rate, or eGFR) and urine tests to assess kidney function.

The Bottom Line

Kidney disease is often called a "silent disease" because symptoms may not appear until kidney function has declined significantly. While the 23 signs discussed above can occur in kidney disease, they are not specific and may have many other causes. Experiencing one or more of these symptoms does not necessarily mean your kidneys are failing.

The best way to detect kidney disease early is through regular medical checkups, especially if you have risk factors such as diabetes, high blood pressure, or a family history of kidney disease. Early diagnosis and treatment can slow progression, reduce complications, and help preserve kidney function for years to come.