Your body can sometimes give you clues that something needs attention. Persistent fatigue, swelling in the ankles or feet, nausea, changes in urination, or unexplained weight loss can have many possible causes. In some people, these symptoms may occur with more advanced kidney disease—but they can also be caused by many other health conditions.

That is why it is important not to diagnose yourself based on a single symptom. Chronic kidney disease often develops gradually, and many people have no noticeable symptoms during its early stages. Blood and urine tests are often needed to determine whether the kidneys are working properly.

At the same time, abdominal fat deserves attention for a different reason. Excess fat around the abdomen is associated with increased health risks, including metabolic and cardiovascular problems. Waist circumference can provide additional information about abdominal fat distribution.

Emergency Note

Seek prompt medical attention for severe abdominal pain, blood in your stool, significant difficulty breathing, chest pain, or other severe or rapidly worsening symptoms.

Unexplained weight loss, persistent nausea or vomiting, swelling, or major changes in urination also deserve medical evaluation, particularly when they persist or occur together.

Why Abdominal Fat Matters

Abdominal fat is not simply a cosmetic concern. Fat stored around the abdomen can be associated with health risks such as type 2 diabetes, high blood pressure, and cardiovascular disease.

There are two commonly discussed types of abdominal fat:

Subcutaneous Fat

Subcutaneous fat is located directly underneath the skin. It is the type of fat you can generally pinch with your fingers.

Visceral Fat

Visceral fat is located deeper inside the abdomen around internal organs. Abdominal fat distribution is associated with metabolic health, although the relationship between different types of abdominal fat and specific risks is complex.

A Simple Waist-Circumference Check

For many adults, waist circumference can be one useful measure when assessing abdominal fat.

NHLBI identifies waist measurements above 40 inches (102 cm) in men and 35 inches (88 cm) in women as unhealthy waist circumferences associated with increased risk. These thresholds are not a diagnosis and should be interpreted alongside other factors such as BMI and overall health.

What Is Creatinine?

Creatinine is a waste product produced through normal muscle metabolism. Healthy kidneys filter creatinine from the blood and remove it through urine.

A blood creatinine measurement is commonly used as part of kidney-function testing. An abnormal result can be a sign that kidney filtration needs further evaluation, but one creatinine result by itself does not establish the cause of a problem.

Doctors typically interpret creatinine together with other information, including estimated kidney function and urine testing.

Why Kidney Disease Can Be Difficult to Notice

One of the most important facts about chronic kidney disease is that it may cause few or no symptoms in its early stages.

According to the National Institute of Diabetes and Digestive and Kidney Diseases, many people do not develop noticeable symptoms until kidney disease has become more advanced. Testing may therefore be the only way to identify kidney disease early.

That makes routine medical evaluation particularly important for people with risk factors such as diabetes, high blood pressure, heart disease, or a family history of kidney failure.

8 Possible Signs That Deserve Attention

These symptoms do not automatically mean you have kidney disease. However, persistent or unexplained symptoms should be discussed with a healthcare professional.

1. Persistent Fatigue

Everyone feels tired sometimes. Persistent fatigue that interferes with everyday activities is different.

Advanced kidney disease can be associated with tiredness and weakness. Anemia related to kidney disease can also contribute to fatigue because damaged kidneys may produce less erythropoietin, a hormone involved in red blood cell production.

Fatigue has many other possible causes, including poor sleep, anemia from other causes, thyroid problems, infections, nutritional deficiencies, and stress.

2. Swelling in the Feet, Ankles, or Legs

Swelling, also called edema, can occur when the body retains extra fluid.

Kidney disease can contribute to edema because damaged kidneys may have difficulty removing extra fluid and sodium. Swelling can occur in the legs, feet, ankles, hands, or face.

However, swollen legs are not specific to kidney disease. Heart problems, vein problems, medications, liver disease, and other conditions can also cause swelling.

3. Shortness of Breath

Breathlessness can have many causes, including heart and lung conditions.

In advanced kidney disease, excess fluid can contribute to shortness of breath. Anemia associated with kidney disease can also cause breathing difficulties.

Severe or sudden difficulty breathing requires urgent medical attention.

4. Persistent Nausea or Loss of Appetite

As kidney disease becomes advanced, some people may experience nausea, vomiting, poor appetite, or weight loss.

But nausea is extremely common and can result from infections, digestive conditions, medications, pregnancy, migraine, and many other causes.

Persistent nausea should be evaluated rather than automatically attributed to the kidneys.

5. Unexplained Weight Loss

Unintentional weight loss can occur with advanced kidney disease, but it can also have numerous other causes.

If you are losing weight without intentionally changing your diet or physical activity, make an appointment with a healthcare professional. The cause should be investigated rather than assuming it is related to kidney function.

6. Changes in Urination

Changes in urination can sometimes occur with kidney disease.

Depending on the condition, you might notice changes in how often you urinate, foamy urine, or other unusual changes. Advanced kidney disease can also cause reduced urine production.

Not every urinary change means kidney disease. Urinary tract infections, dehydration, diabetes, medications, and other conditions can also affect urination.

7. Trouble Concentrating

Advanced kidney disease can be associated with difficulty concentrating, sleep problems, and other changes in mental function.

Because concentration problems have many possible explanations, they should be considered in the context of your overall health.

8. Persistent Itching or Muscle Cramps

Itching and muscle cramps can occur in advanced kidney disease, particularly when kidney dysfunction affects fluid, mineral, and electrolyte balance.

Again, these symptoms are not specific to kidney disease and can have many other causes.

What About Medications and Weight Gain?

Some medications can contribute to weight gain or make weight management more difficult. Examples can include certain antidepressants, corticosteroids, and other medications.

However, medications vary considerably, and you should never stop a prescribed medicine on your own because you suspect it is affecting your weight.

Instead, talk with your doctor or pharmacist. They can determine whether a medication could be contributing to weight changes and whether an alternative or dosage adjustment is appropriate.

How Is Kidney Disease Diagnosed?

Symptoms alone cannot confirm kidney disease.

Healthcare professionals commonly use blood and urine tests to evaluate kidney health. Blood testing can assess creatinine and estimate kidney filtration, while urine testing can look for abnormalities such as excess protein.

Depending on the situation, additional testing may be necessary.

Who Should Consider Kidney Testing?

Talk with your healthcare professional about kidney testing if you have risk factors such as:

• Diabetes
• High blood pressure
• Heart or cardiovascular disease
• A family history of kidney failure
• Other conditions that may affect kidney function

Early kidney disease may be silent, so waiting for symptoms is not always the best way to detect it.

What You Can Do for Better Kidney and Metabolic Health

There is no overnight drink, cleanse, or home remedy that can remove “15 kilograms of waste” from the colon or repair kidney disease.

Instead, focus on evidence-based habits:

• Keep blood pressure under control.
• Manage blood glucose if you have diabetes.
• Maintain a healthy weight.
• Stay physically active.
• Take prescribed medications as directed.
• Avoid smoking.
• Work with your healthcare professional on an appropriate eating plan.
• Have kidney function checked when you have important risk factors.

The Bottom Line

Fatigue, swelling, nausea, shortness of breath, weight loss, and urinary changes can occur with advanced kidney disease—but none of these symptoms alone proves that your kidneys are failing.

The bigger lesson is that early kidney disease can be surprisingly quiet. If you have diabetes, high blood pressure, heart disease, or a family history of kidney failure, appropriate blood and urine testing can be much more informative than waiting for symptoms to appear.

And when symptoms such as severe pain, significant breathing difficulty, chest pain, blood in the stool, or rapidly worsening swelling appear, seek medical care promptly.

Your body doesn’t need a “one-night cleanse.” It needs the right evaluation when something doesn’t feel right.