Your kidneys may be small, but they do some of the most important work in your body. They help filter waste from the blood, balance fluids, regulate minerals, support blood pressure control, and play a role in red blood cell production. When kidney function begins to decline, the body may send warning signals—some obvious, others easy to overlook.

The challenge is that kidney disease can be quiet in the early stages. Many people may not feel sick at first, and testing blood and urine is often the only way to know for sure whether the kidneys are working properly. The CDC notes that people with chronic kidney disease may not notice symptoms, which is why blood and urine tests are important for diagnosis.

Still, when kidney problems become more advanced or when fluid and waste begin building up, certain symptoms may appear. These signs do not always mean you have kidney disease, but they are worth paying attention to—especially if they are persistent, worsening, or appear alongside other health concerns.

Here are 10 possible warning signs your kidneys may need medical attention.

1. Persistent Fatigue and Low Energy

Feeling tired after a long day is normal. But fatigue that does not improve with rest may be a sign that something deeper is happening.

When kidney function declines, waste products can build up in the blood. Kidney disease can also contribute to anemia, a condition where the body does not have enough healthy red blood cells to carry oxygen efficiently. The National Kidney Foundation explains that anemia related to kidney disease may cause weakness, tiredness, shortness of breath, and trouble concentrating.

If you feel exhausted all the time, struggle to focus, or feel weak without a clear reason, it may be worth discussing kidney screening with your healthcare provider.

2. Changes in Urination

Because the kidneys produce urine, changes in urination can be one of the clearest signs that something may be wrong.

Possible changes include urinating more often, urinating less than usual, waking up frequently at night to urinate, urine that looks foamy or bubbly, dark or cloudy urine, blood in the urine, or pain and burning during urination.

Foamy urine may sometimes suggest protein in the urine, while painful or burning urination may point to an infection. NIDDK lists cloudy, dark, bloody, or foul-smelling urine and frequent or painful urination among possible symptoms of kidney infection.

Any blood in the urine or sudden major change in urination should be checked by a medical professional.

3. Swelling in the Face, Feet, Ankles, or Hands

Swelling can happen when the body holds on to extra fluid and sodium. If the kidneys cannot remove fluid properly, swelling may show up in the feet, ankles, legs, hands, or around the eyes.

The National Kidney Foundation explains that protein leaking into the urine can allow fluid to shift into other parts of the body, sometimes causing puffiness around the eyes or swelling elsewhere.

Swelling can have many causes, including heart, liver, vein, medication, and hormonal issues. But if swelling is persistent, unexplained, or worsening, it should not be ignored.

4. Dry, Itchy Skin

Healthy kidneys help remove waste and maintain the right balance of minerals in the blood. When kidney function declines, waste buildup and mineral imbalances may contribute to skin problems.

Dry, itchy skin can appear in more advanced kidney disease. Mayo Clinic lists dry, itchy skin among symptoms that may occur as chronic kidney disease progresses.

Itching related to kidney problems may be widespread and may not improve much with regular moisturizer. If itching is persistent, severe, or comes with other symptoms such as swelling, fatigue, or appetite loss, medical evaluation is important.

5. Shortness of Breath

Shortness of breath can be frightening, and it should always be taken seriously.

Kidney problems may contribute to breathing difficulty in two main ways. First, extra fluid may build up in the body and affect the lungs. Second, anemia can reduce oxygen delivery, making a person feel breathless or weak.

The National Kidney Foundation notes that fluid overload can cause swelling, high blood pressure, and breathing problems.

Seek urgent medical attention if shortness of breath is sudden, severe, occurs with chest pain, or happens while resting or lying down.

6. Nausea, Vomiting, or Loss of Appetite

When the kidneys are not filtering waste properly, toxins may accumulate in the bloodstream. This can affect digestion and appetite.

Some people may experience nausea, vomiting, a metallic taste in the mouth, bad breath, or reduced interest in food. Mayo Clinic lists nausea, vomiting, and loss of appetite among symptoms that may appear as kidney disease progresses.

These symptoms are common in many conditions, so they do not automatically mean kidney disease. But if they continue or happen alongside fatigue, swelling, or changes in urination, they deserve attention.

7. Trouble Sleeping

Kidney problems may affect sleep in several ways. Some people wake frequently to urinate. Others may experience itching, muscle cramps, restless legs, or general discomfort related to waste buildup and fluid imbalance.

Trouble sleeping can have many causes, including stress, sleep apnea, medications, and lifestyle factors. But when sleep disruption appears with other kidney-related symptoms, it may be part of a larger pattern.

A healthcare provider can help determine whether kidney testing, sleep evaluation, or another type of care is needed.

8. Muscle Cramps

Muscle cramps may occur when electrolyte levels become imbalanced. The kidneys help regulate minerals such as sodium, potassium, calcium, and phosphorus. When kidney function declines, these balances may be disrupted.

Mayo Clinic includes muscle cramps among symptoms that may occur as chronic kidney disease progresses.

Occasional cramps can happen from dehydration, exercise, or mineral changes. But frequent or severe cramping—especially with swelling, weakness, or changes in urination—should be discussed with a medical professional.

9. High Blood Pressure

High blood pressure and kidney disease are closely connected. High blood pressure can damage kidney blood vessels over time, and kidney problems can also make blood pressure harder to control.

This is why routine checkups matter. You may not feel high blood pressure, but it can quietly harm the heart, brain, blood vessels, and kidneys.

People with diabetes, high blood pressure, a family history of kidney disease, or older age may need regular kidney screening. The CDC emphasizes that blood and urine tests are needed to know whether someone has chronic kidney disease.

10. Puffiness Around the Eyes

Puffiness around the eyes, especially if it happens often, may be linked to protein leaking into the urine. When protein levels in the blood drop, fluid can shift into tissues and cause visible swelling.

NIDDK notes that nephrotic syndrome symptoms may include puffy eyelids, swelling in the legs, foamy urine, weight gain from fluid retention, tiredness, and loss of appetite.

Eye puffiness can also come from allergies, lack of sleep, sinus problems, or diet. But if it appears with foamy urine, swelling in the legs, or fatigue, kidney testing may be needed.

When Should You See a Doctor?

You should seek medical care promptly if you notice blood in your urine, sudden swelling, severe shortness of breath, chest pain, confusion, very little urination, persistent vomiting, fever with back or side pain, or swelling with severe pain.

You should also consider kidney screening if symptoms are mild but persistent, especially if you have diabetes, high blood pressure, heart disease, obesity, a family history of kidney disease, or take medications that can affect kidney function.

How Kidney Problems Are Checked

Kidney function is commonly checked with blood and urine tests. A blood test can estimate how well the kidneys are filtering, while a urine test can look for protein or other abnormalities. Blood pressure measurement is also important because kidney health and blood pressure are closely linked.

Early detection can make a major difference. In many cases, managing blood pressure, controlling blood sugar, adjusting medications, reducing excess salt, staying hydrated, and following medical advice may help slow kidney damage.

The Bottom Line

Your body often gives warning signs when something is wrong. Fatigue, changes in urination, swelling, itchy skin, shortness of breath, nausea, sleep problems, cramps, high blood pressure, and puffiness around the eyes can all be possible clues that your kidneys may need attention.

These symptoms do not always mean kidney disease, but they should not be ignored—especially when they continue, worsen, or appear together.

The safest step is simple: talk to a qualified healthcare provider and ask whether kidney testing is appropriate.

Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you have concerning symptoms or a medical condition, consult a qualified healthcare professional.