The colour of your urine can provide important clues about your overall health, particularly your kidney function. Healthy kidneys filter waste and excess fluids from the blood, producing urine that is typically light yellow to amber in colour. However, when the kidneys begin to fail, noticeable changes in urine colour and consistency may occur. Dark, foamy, red, or cloudy urine can signal underlying kidney problems such as chronic kidney disease or acute kidney injury. Monitoring urine changes is a simple yet effective way to detect early warning signs of kidney failure and seek timely medical attention to prevent further damage. Let's take a look....Understanding kidney function and urine colourHealthy kidneys filter blood, remove waste, and create urine to expel toxins. They also regulate water balance, electrolytes, and blood pressure. When your kidneys are functioning properly, your urine is usually light yellow to amber in color, depending on hydration levels. Additionally, healthy kidney function supports red blood cell production, maintains bone health, and ensures overall internal chemical balance.However, when kidneys are compromised, toxins can build up, and urine may change in colour, odour, volume, and foaminess, indicating possible dysfunction.What colour is urine when your kidneys are failing1. Dark brown or cola-coloured urineOne of the most common urine changes in kidney failure is a dark brown, tea-colored, or cola-colored appearance. This may occur due to the presence of:Blood in the urine (hematuria)Excess muscle breakdown products (myoglobin)Concentrated waste due to reduced kidney functionThis colour change is often seen in both acute and chronic kidney failure.2. Red or pink urineRed or pink urine may signal blood in the urine, a condition known as hematuria. This can occur when the kidneys' filtering units (glomeruli) become damaged.Possible causes include:GlomerulonephritisPolycystic kidney diseaseKidney infections or injuryNote: While red urine can also result from foods like beets, persistent discoloration should be medically evaluated.3. Foamy or bubbly urineFoamy urine can indicate the presence of excess protein, especially albumin. This is often one of the earliest signs of chronic kidney disease (CKD).Foam or bubbles in the toilet bowl after urination may suggest:Proteinuria (protein in urine)Early kidney damageHigh blood pressure-related kidney stressThis symptom should not be ignored, particularly if persistent.4. Cloudy or murky urineCloudy urine can be associated with:Urinary tract infectionsKidney stonesKidney inflammation (nephritis)It may also come with a foul odour or discomfort during urination. Though not always linked to kidney failure, cloudy urine may signal an underlying condition that can damage kidneys if left untreated.5. Pale or colourless urineExtremely clear or colourless urine often means you are well-hydrated. However, consistently pale urine may indicate overhydration or inability of the kidneys to concentrate urine, which could be a sign of:Diabetes insipidusChronic kidney disease in its advanced stageWhile not a direct sign of kidney failure, it may require further investigation if accompanied by other symptoms.Other symptoms of kidney failure to watch forUrine colour is just one of many signs that could point to kidney dysfunction. Other key symptoms include:Swelling in the legs, ankles, or feet (edema)Fatigue or weaknessNausea and vomitingShortness of breathPersistent itchingMetallic taste in the mouthDifficulty concentratingDecreased urine outputIf any of these are present along with unusual urine colour, consult a healthcare provider immediately.What causes urine colour changes in kidney failureUrine colour changes occur due to the kidneys' reduced ability to filter and eliminate waste effectively. Common causes include:Chronic kidney disease (CKD)Acute kidney injury (AKI)GlomerulonephritisDiabetes-related nephropathyHypertensionUrinary tract infectionsKidney stonesProper diagnosis and treatment of the underlying cause are essential to preserving kidney function.When to see a doctor about urine colourSeek medical attention if you notice:Sudden and unexplained changes in urine colourPersistent dark or red urineFoamy urine lasting more than a few daysPain or discomfort during urinationSwelling or other symptoms of kidney stressHow to protect your kidney healthMaintaining healthy kidneys involves lifestyle changes and regular monitoring. Tips include:Staying well-hydratedManaging blood pressure and blood sugarAvoiding excessive use of NSAIDs or over-the-counter medicationsReducing salt intakeLimiting alcohol and quitting smokingEating a kidney-friendly dietGetting regular check-ups and blood/urine testsDisclaimer: This information is intended for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you experience any concerning symptoms or changes in urine colour, please consult a healthcare provider promptly. Always follow your doctor's guidance for managing kidney health.Also read | Why kidney infections spike during the monsoon season and how to stay safe