10 Subtle Signs YourYour kidneys perform essential jobs every day: they remove waste and excess fluid from your blood, help regulate blood pressure and electrolytes, and contribute to red-blood-cell production and Kidneys May Not Be Working Properly
Your kidneys perform essential jobs every day: they remove waste and excess fluid from your blood, help regulate blood pressure and electrolytes, and contribute to red-blood-cell production and bone health.
One of the biggest challenges with chronic kidney disease (CKD) is that it can develop with few or no obvious symptoms in its early stages. In fact, many people don’t realize they have kidney disease until it has become more advanced.
However, symptoms can appear as kidney function declines. Here are 10 signs worth knowing.
1. Changes in Urination
Changes in how often you urinate, how much urine you produce, or the appearance of your urine can sometimes indicate a kidney or urinary problem.
You might notice:
- Urinating much more or less frequently
- Needing to urinate repeatedly, particularly at night
- Foamy or unusually bubbly urine
- Blood in the urine
Foamy urine can occur for several reasons, but persistent foam may be associated with protein in the urine, which can be an early sign of kidney damage.
2. Swelling in the Legs, Ankles, or Feet
Healthy kidneys help remove excess sodium and fluid.
When kidney function is impaired, the body may retain fluid, potentially causing edema (swelling). It may be particularly noticeable around the ankles, feet, legs, hands, or sometimes around the eyes.
Swelling has many possible causes, though, including heart, liver, and circulation problems.
3. Persistent Fatigue
Kidney disease can contribute to tiredness and reduced energy.
One reason is that damaged kidneys may produce less erythropoietin (EPO), a hormone involved in red-blood-cell production. This can contribute to anemia.
Kidney-related anemia may cause:
- Fatigue
- Weakness
- Difficulty concentrating
- Shortness of breath with activity
4. Changes in Appetite or Nausea
As kidney disease becomes more advanced, waste products can accumulate in the bloodstream.
This may lead to:
- Reduced appetite
- Nausea
- Vomiting
- An unpleasant or metallic taste
- Food tasting different
These symptoms aren’t specific to kidney disease, but persistent unexplained symptoms deserve medical evaluation.
5. Itchy or Dry Skin
Persistent itching can occur in advanced kidney disease, partly because abnormalities in mineral balance and accumulation of waste products can affect the skin and nervous system.
Occasional dry or itchy skin is extremely common, so this symptom alone doesn’t mean your kidneys are failing.
6. Muscle Cramps
Kidney disease can disturb the body’s balance of electrolytes and minerals, potentially contributing to muscle cramps or weakness.
Cramps can also result from dehydration, exercise, medications, or many other conditions.
7. Puffiness Around the Eyes
Swelling around the eyes, particularly when it is persistent, can sometimes be associated with protein leaking into the urine.
This happens because damaged kidney filters can allow substances that should normally remain in the bloodstream to pass into the urine.
Again, there are numerous other explanations for puffy eyes, including allergies, lack of sleep, and fluid retention.
8. Difficulty Sleeping
People with chronic kidney disease may experience sleep problems.
Possible contributors include itching, muscle cramps, restless legs, sleep apnea, anxiety, and changes associated with advanced kidney disease.
Difficulty sleeping by itself is not a reliable indicator of kidney disease, but it canAdvanced kidney dysfunction can cause waste products to accumulate in the blood. This can contribute to problems with concentration, occur alongside other symptoms.
9. Difficulty Concentrating or Feeling “Foggy”
Advanced kidney dysfunction can cause waste products to accumulate in the blood. This can contribute to problems with concentration, alertness, or mental clarity.
Sudden confusion, however, is not something to assume is caused by kidney disease and requires prompt medical attention.
10. High Blood Pressure
The relationship between kidney disease and high blood pressure goes in both directions.
Damaged kidneys can contribute to high blood pressure, while long-standing high blood pressure can damage the kidneys.
That’s why regular blood-pressure checks are particularly important for people at increased risk of kidney disease.
The Most Important Point: Don’t Wait for Symptoms
The phrase “you can lose 90% of kidney function before you feel sick” is a simplified statement, not a precise rule that applies to everyone.
The more important fact is that early kidney disease can be silent. You shouldn’t wait for symptoms before checking your kidney health if you have risk factors.
Doctors commonly evaluate kidney health using blood and urine tests, including:
- eGFR — estimates how well the kidneys are filtering blood.
- Urine albumin-to-creatinine ratio (UACR) — checks for albumin/protein leaking into the urine.
- Serum creatinine — a blood measurement used in estimating kidney function.
- Blood pressure measurement.Contact a healthcare professional if you have persistent changes in urination, blood in your urine, unexplained swelling, ongoing fatigue, or
People with diabetes, high blood pressure, cardiovascular disease, a family history of kidney disease, or previous kidney problems may need particular attention to kidney screening.
When to Seek Medical Care
Contact a healthcare professional if you have persistent changes in urination, blood in your urine, unexplained swelling, ongoing fatigue, or several of these symptoms together.
Seek urgent medical attention for severe shortness of breath, chest pain, severe confusion, very little or no urine, or rapidly worsening swelling.
Bottom line: Kidney disease can develop quietly, so symptoms aren’t the best way to detect it. If you’re at risk, a simple blood test and urine test can often provide much more useful information than waiting until you feel seriously ill.
