According to the Harvard Health website, melanoma is “the most serious type of cancer.
“In rare instances, [melanoma] can put melanin, the pigment that darkens the skin, in circulation, and some of that pigment may wind up in the urine.”
The health body explains that when urine turns “truly brown”, this may be caused by a breakdown product of haemoglobin – bilirubin.
“[Bilirubin] builds up in the blood because of liver conditions, like hepatitis and cirrhosis, or a bile duct blocked by a gallstone, a tumour, or some other obstacle.
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source: express.co.uk