The kidneys are essential organs that help keep the body healthy by filtering waste products from the blood, removing excess water, balancing minerals, and supporting blood pressure regulation. When the kidneys begin to struggle, these functions may become less effective, allowing waste and fluid to build up in the body.
One of the biggest challenges with kidney problems is that the early symptoms are not always obvious. Some people experience tiredness, changes in urination, or swelling, while others may have no noticeable symptoms until the condition becomes more advanced. Recognising possible warning signs and seeking medical advice early can help protect kidney health.
In this article, we explain the first signs your kidneys may be struggling, what causes these symptoms, who is at greater risk, and when to seek medical attention.
1. Changes in Urination
Changes in urination can sometimes be an early warning sign of kidney problems. Healthy kidneys filter the blood and help regulate the amount of water and waste removed through urine. When kidney function is affected, the amount, appearance, or frequency of urination may change.
Some people notice that they need to urinate more frequently, particularly at night. Others may produce less urine than usual. Urine may also appear unusually foamy, which can sometimes indicate excess protein in the urine.
However, these changes do not always mean that the kidneys are damaged. Urinary infections, diabetes, certain medicines, and other conditions can cause similar symptoms.
Persistent changes in urination should be discussed with a healthcare professional, particularly if they occur alongside swelling, fatigue, or high blood pressure.
2. Swelling in the Feet, Ankles, or Hands
Swelling is another possible sign that the kidneys are not removing excess fluid effectively.
When kidney function decreases, the body may retain salt and water. This can cause fluid to accumulate in different parts of the body, especially the feet, ankles, legs, and hands. Some people also notice puffiness around their eyes, particularly in the morning.
Mild swelling can have many causes, including prolonged sitting, certain medicines, and problems involving the heart or circulation. However, unexplained or persistent swelling should not be ignored.
If swelling develops suddenly or occurs with shortness of breath, chest discomfort, or a rapid increase in body weight, seek urgent medical assessment.
3. Feeling Tired or Weak
Persistent tiredness may be associated with reduced kidney function.
Healthy kidneys produce a hormone called erythropoietin, which helps the body make red blood cells. When kidney disease becomes advanced, reduced production of this hormone can contribute to anaemia. Anaemia reduces the blood’s ability to carry oxygen efficiently and may cause fatigue, weakness, dizziness, or difficulty concentrating.
Kidney disease can also contribute to tiredness through changes in sleep, nutrition, and the body’s chemical balance.
Nevertheless, fatigue is a very common symptom with many possible causes, including poor sleep, stress, iron deficiency, thyroid problems, and other illnesses.
If you regularly feel exhausted despite getting adequate rest, consult a healthcare professional to identify the underlying cause.
4. Foamy or Bubbly Urine
Urine that repeatedly appears unusually foamy may indicate that protein is leaking into the urine. This condition is known as proteinuria and can occur when the kidneys’ filtering structures are damaged.
Normally, the kidneys retain most proteins in the bloodstream. When their filters become damaged, proteins such as albumin may pass into the urine.
Occasional bubbles or foam are not necessarily a sign of kidney disease. A strong urine stream, concentrated urine, or cleaning products in the toilet can also produce bubbles.
However, persistent foamy urine, particularly when accompanied by swelling around the eyes or ankles, deserves medical evaluation. A urine albumin test can help determine whether excess protein is present.
5. Blood in the Urine
Blood in the urine, known medically as haematuria, can sometimes indicate a kidney problem.
The urine may appear pink, red, or brown, although small amounts of blood may only be detected through laboratory testing. Possible causes include kidney disease, kidney stones, urinary tract infections, and other conditions affecting the urinary system.
Blood in the urine should always be assessed by a healthcare professional, even if it occurs only once or is not accompanied by pain.
It is important not to assume that visible blood automatically means kidney failure. Proper examination and testing are needed to determine the cause.
6. High Blood Pressure
High blood pressure and kidney disease are closely connected.
The kidneys help regulate blood pressure by controlling fluid balance and producing substances involved in blood vessel regulation. When the kidneys are damaged, blood pressure may rise. In turn, persistently high blood pressure can damage the small blood vessels inside the kidneys, making kidney disease worse.
Many people with high blood pressure have no obvious symptoms, which is why regular blood pressure checks are important.
If you have hypertension, monitoring your blood pressure and following your treatment plan can help reduce the risk of kidney complications. Your doctor may recommend kidney-function blood tests and urine tests, especially if you have diabetes or other risk factors.
7. Loss of Appetite, Nausea, or Vomiting
When kidney function becomes significantly reduced, waste products can accumulate in the bloodstream. This may contribute to nausea, vomiting, reduced appetite, or an unpleasant taste in the mouth.
Some people experience unexplained weight loss because they feel less interested in food or become full more quickly.
These symptoms are not specific to kidney disease. Digestive disorders, infections, medication side effects, and many other conditions can cause similar problems.
Persistent nausea or loss of appetite should be investigated, especially when combined with changes in urination, swelling, or unusual fatigue.
Severe vomiting, inability to keep fluids down, or signs of dehydration require prompt medical attention.
8. Dry, Itchy Skin
Dry or itchy skin can occur in people with more advanced kidney disease.
The kidneys help maintain the balance of minerals and other substances in the blood. When kidney function is significantly impaired, changes in mineral balance and the accumulation of certain waste products may contribute to itching.
However, itchy skin is far more commonly associated with conditions such as dry skin, eczema, allergies, or medication reactions.
If itching persists without an obvious explanation, particularly if you also have other possible signs of kidney problems, speak with your healthcare professional.
9. Muscle Cramps and Difficulty Concentrating
Some people with kidney disease experience muscle cramps, weakness, sleep disturbances, or difficulty concentrating.
These symptoms may be associated with changes in fluid levels, mineral imbalances, anaemia, or the effects of advanced kidney disease on the body.
Muscle cramps can also result from exercise, dehydration, certain medicines, and other health conditions. Difficulty concentrating may be related to poor sleep, stress, or many unrelated causes.
A doctor can assess these symptoms and determine whether kidney testing or other investigations are appropriate.
10. Shortness of Breath
Shortness of breath can occur when kidney disease causes significant fluid retention, including fluid accumulation in or around the lungs. Anaemia associated with chronic kidney disease can also contribute to breathlessness, especially during physical activity.
This symptom can also indicate serious heart or lung problems and should never be assumed to be caused by the kidneys without medical assessment.
Seek emergency medical care if you develop severe or sudden shortness of breath, chest pain, fainting, or difficulty breathing while resting.
11. What Causes the Kidneys to Struggle?
Several medical conditions and lifestyle-related factors can increase the risk of kidney disease.
Diabetes
High blood sugar can gradually damage the kidneys’ filtering structures. Diabetes is one of the leading causes of chronic kidney disease.
High blood pressure
Persistently elevated blood pressure can damage kidney blood vessels and reduce their ability to filter blood effectively.
Kidney infections and other kidney conditions
Certain infections, inherited conditions, inflammation, and structural problems can affect kidney function.
Kidney stones or urinary blockages
Stones and other obstructions can interfere with the flow of urine. Significant or prolonged obstruction may damage the kidneys.
Certain medicines
Frequent or prolonged use of some painkillers, particularly nonsteroidal anti-inflammatory drugs such as ibuprofen, can increase the risk of kidney injury in susceptible people. Risk may be greater during dehydration or in people with existing kidney disease.
Always seek professional advice about medicines if you have kidney disease or are at increased risk.
Family history and age
The risk of chronic kidney disease increases with age. A family history of kidney disease may also increase the likelihood of certain kidney conditions.
12. How Can You Check Whether Your Kidneys Are Healthy?
Symptoms alone cannot reliably determine whether your kidneys are functioning properly. Many people with early chronic kidney disease feel completely healthy.
Doctors commonly use two important types of tests to assess kidney health.
Blood test: A serum creatinine test measures the level of creatinine in the blood. The result is used to estimate the glomerular filtration rate, known as eGFR, which helps assess how well the kidneys filter blood.
Urine test: A urine albumin-to-creatinine ratio, or uACR, checks for albumin, a protein that may leak into the urine when the kidneys’ filtering structures are damaged. A routine urinalysis may also identify blood or other abnormalities.
Depending on the findings, a doctor may recommend blood pressure measurement, additional blood or urine tests, or imaging.
People with diabetes, high blood pressure, cardiovascular disease, or a family history of kidney disease should ask their healthcare professional whether regular kidney screening is appropriate.
13. How Can You Protect Your Kidney Health?
Although not every kidney condition can be prevented, several measures can help reduce the risk of kidney damage.
- Keep blood pressure within the target range recommended by your healthcare professional.
- Manage blood sugar carefully if you have diabetes.
- Drink enough fluids to meet your needs, while following medical advice if you have a condition requiring fluid restriction.
- Eat a balanced diet and limit excessive salt intake.
- Exercise regularly and maintain a healthy weight.
- Avoid smoking.
- Use medicines, including painkillers, responsibly and according to medical advice.
- Attend recommended health checks and follow up on abnormal blood or urine results.
Avoid unproven kidney-cleansing products and herbal remedies that claim to remove toxins. Some supplements may contain harmful ingredients or interact with prescribed medicines.
14. Frequently Asked Questions
What is the first sign of kidney problems?
There is no single first sign. Early kidney disease often causes no symptoms. When symptoms occur, possible signs include changes in urination, persistent foamy urine, swelling, and fatigue.
Can kidney problems occur without pain?
Yes. Chronic kidney disease often develops without pain or noticeable symptoms. Blood and urine tests can identify kidney problems before a person feels unwell.
What colour is urine when the kidneys are not working properly?
There is no single urine colour that reliably indicates kidney disease. Blood may make urine appear pink, red, or brown, while concentrated urine may appear darker. Colour alone cannot diagnose kidney problems.
Can drinking water repair damaged kidneys?
Drinking enough water helps prevent dehydration, but it does not reverse established chronic kidney damage. People with advanced kidney disease or certain heart conditions may need to limit fluids under medical supervision.
Can kidney function improve?
Some causes of acute kidney injury are reversible when treated promptly. Chronic kidney disease may be manageable, and its progression can sometimes be slowed, but established damage may not be reversible.
When should I see a doctor?
Arrange a medical assessment if you experience persistent changes in urination, unexplained swelling, blood in the urine, or ongoing fatigue. Seek urgent medical care for severe breathing difficulties, chest pain, confusion, or a sudden major reduction in urine output.
Conclusion
The first signs that your kidneys may be struggling can be subtle. Changes in urination, persistent foamy urine, swelling, fatigue, high blood pressure, and unexplained nausea may indicate a problem, but these symptoms can also have other causes.
The most important point is that early kidney disease often causes no noticeable symptoms. If you have diabetes, high blood pressure, a family history of kidney disease, or concerns about your kidney health, speak with a healthcare professional about appropriate blood and urine tests.
Early detection, proper medical care, and effective management of underlying conditions can help protect kidney function and reduce the risk of complications. Never rely on symptoms alone to determine whether your kidneys are healthy.
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