Introduction
Green or blue-green urine is a colour change, not a diagnosis. There is no recognised condition called 'green chronic kidney disease,' and this content does not diagnose chronic kidney disease. Possible causes include artificial dyes, medicines or medical dyes, and a urinary tract infection (UTI). The symptoms and recent exposures determine what evaluation is needed.
Food and Dyes
Artificial colours in food, drinks or medicines can produce blue or green urine. A colour change that starts after a known dye and clears after the exposure ends may be benign, but timing alone cannot confirm the cause. An unexplained change or one that does not go away should be assessed rather than attributed to food by guesswork.
Medications and Medical Dyes
Reported medicine-related causes include propofol, indomethacin, amitriptyline and cimetidine; methylene blue and other medical dyes can also produce a blue-green colour. A recent medicine or procedure is useful information for a clinician, but it does not rule out infection or another cause. Do not stop a prescribed medicine on your own. Contact the prescriber or pharmacist for product-specific advice.
Medical Conditions and Infections
A UTI, including infection with pigment-producing Pseudomonas aeruginosa, is one possible cause. Burning or pain when urinating, frequent urination, fever, or pain in the back or side makes infection more concerning. Green or dark urine accompanied by yellow skin or eyes or pale stools needs urgent assessment, but these warning signs do not establish what caused the colour change.
When to See a Doctor
Seek urgent medical care if green urine occurs with fever or chills, back or side pain, vomiting, or feeling very unwell, or if green or dark urine occurs with yellow skin or eyes or pale stools. Contact a healthcare professional promptly for pain or burning when urinating, frequent urination or blood in the urine, and contact one if the colour is unexplained or does not go away. If it began after a medicine or procedure, contact the prescriber or pharmacist and do not stop a prescribed medicine unless they tell you to.
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