Blood in the urine, which can be a sign of kidney disease, infections, or injury to the urinary system.
From Greek 'haima' (blood) + 'ouron' (urine). Medical scientists combined these roots in the 19th century to name this observable symptom of internal health problems.
Haematuria scared ancient doctors because blood in urine seemed mysterious—now we know it could mean anything from kidney stones to a urinary tract infection.
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