In
medicine,
hematuria, or
haematuria, is the presence of
red blood cells (erythrocytes) in the
urine. It may be
idiopathic and/or
benign, or it can be a sign that there is a
kidney stone or a
tumor in the
urinary tract (
kidneys,
ureters,
urinary bladder,
prostate, and
urethra), ranging from trivial to lethal. If
white blood cells are found in addition to red blood cells, then it is a signal of
urinary tract infection.