Several days following throat or skin infection by certain bacteria, inflammation of the glomeruli (tufts of capillaries in the kidney) may occur. This inflammation, called glomerulonephritis, may result in red bloods cells entering the urine where they breakdown releasing their contents thereby causing the urine to have a dark or smoky color resembling coca-cola – coca-cola colored urine.
Tasic V, Polenakovic M: Acute poststreptococcal glomerulonephritis following circumcision. Pediatr Nephrol 2000, 15(3-4):274-5. Go to reference