1. Changes in Urination

A noticeable change in how often you urinate, especially if it persists, can sometimes be associated with kidney or urinary problems. Some people may urinate more often, particularly at night, while others may produce less urine.

2. Foamy or Frothy Urine

Persistent foaminess in the urine can sometimes indicate excess protein in the urine. Protein leakage, known as proteinuria or albuminuria, can be an important sign of kidney damage.

Occasional bubbles are not necessarily a problem, but persistent or unusually frothy urine deserves medical attention.

3. Blood in the Urine

Pink, red, or cola-colored urine may indicate blood in the urinary tract. Kidney disease is one possible cause, although urinary infections, kidney stones, medications, and other conditions can also cause this change.

Visible blood in the urine should be evaluated by a healthcare professional.

4. Swelling Around the Ankles or Feet

Damaged kidneys may have difficulty removing excess salt and fluid from the body. Fluid retention can contribute to swelling in the feet, ankles, legs, hands, or around the eyes.

Swelling has many possible causes, so it should not automatically be assumed to be kidney disease.

5. Puffiness Around the Eyes

Swelling or puffiness around the eyes, particularly when it is persistent, can sometimes occur when protein is leaking into the urine and fluid balance is affected.

If this change is new or unexplained, consider discussing it with a healthcare professional.

6. Unusual Tiredness

Kidney disease can contribute to anemia and the buildup of waste products in the bloodstream. As a result, some people may experience persistent tiredness, weakness, or reduced energy.

Fatigue is extremely common and has many possible explanations, so testing is needed to determine the cause.

7. Difficulty Concentrating

Some people with more advanced kidney disease experience difficulty concentrating, reduced alertness, or trouble thinking clearly. This can occur as waste products accumulate in the blood or when complications such as anemia develop.

Sudden confusion, however, requires prompt medical evaluation.

8. Persistent Itching

Persistent or widespread itching can occur in advanced kidney disease, partly because waste products and mineral imbalances can affect the skin.

Itching is much more commonly caused by other conditions, so it should not be used alone to diagnose a kidney problem.

9. Muscle Cramps

Kidney problems can affect the body’s balance of minerals and electrolytes. This may contribute to muscle cramps, weakness, or unusual muscle sensations.

Frequent or severe cramps deserve evaluation, especially when accompanied by other symptoms.

10. Nausea or Loss of Appetite

As kidney function becomes significantly impaired, waste products can build up in the bloodstream. This may contribute to nausea, vomiting, poor appetite, or an unpleasant taste in the mouth.

These symptoms can also occur with infections, digestive problems, medications, and many other conditions.

11. Shortness of Breath

Shortness of breath can occur when excess fluid builds up in the body or when kidney disease contributes to anemia.

Because breathing difficulty can have serious heart and lung causes, new or severe shortness of breath should be assessed promptly rather than assumed to be a kidney symptom.

12. Changes in Sleep

Some people with chronic kidney disease report difficulty sleeping, restless legs, or disrupted sleep. Several factors may contribute, including itching, muscle discomfort, anemia, and changes associated with kidney disease.

Persistent sleep problems should be discussed with a healthcare professional.

13. Dry or Unusually Dark Urine

Dark urine can occur when you are dehydrated, but changes in urine color can have other causes as well. Dehydration is particularly common after sweating, vomiting, diarrhea, or inadequate fluid intake.

If urine remains unusually dark despite adequate hydration, or if it is accompanied by pain or blood, seek medical advice.

14. Pain in the Side or Lower Back

Pain around the sides of the back, particularly below the ribs, can occur with kidney stones or certain kidney infections. Kidney-related pain is not always present with chronic kidney disease, however.

Severe pain, especially when accompanied by fever, vomiting, blood in the urine, or difficulty urinating, warrants prompt medical attention.

15. High Blood Pressure

High blood pressure can both contribute to kidney damage and develop as kidney function declines. Unfortunately, high blood pressure often causes no noticeable symptoms.

Regular blood-pressure checks are therefore important, especially for people with diabetes, a family history of kidney disease, cardiovascular disease, or other risk factors.

When Should You Get Checked?

Do not wait for symptoms if you have an increased risk of kidney disease. Diabetes, high blood pressure, cardiovascular disease, a family history of kidney disease, and certain other conditions can increase risk.

Simple tests can provide important information about kidney health. Healthcare professionals commonly use a blood test to estimate kidney filtration (eGFR) and urine testing to look for albumin or other abnormalities.

Important Warning Signs

Some symptoms require prompt medical attention. Seek urgent care for severe or rapidly worsening symptoms such as difficulty breathing, very little or no urine, severe flank pain with fever, significant blood in the urine, persistent vomiting with dehydration, or sudden confusion.

Most importantly, one symptom does not mean you have kidney disease. Many of these signs can be caused by other health conditions. Proper testing is the best way to determine what is happening.

Taking persistent changes seriously and discussing them with a healthcare professional can help identify kidney problems earlier, when appropriate treatment and lifestyle changes may help protect kidney function.