bloodstream that seems inside urine. Also known as hematuria. Gross hematuria relates to blood that is so plentiful inside urine that blood is visible in just the naked-eye. Microhematuria means bloodstream in urine that is noticeable only under a microscope; there is certainly so small bloodstream that it is not seen without magnification. Hematuria, whether gross or microscopic, is unusual and should be additional examined. It might probably or may not be combined with discomfort. Painful hematuria may be due to several conditions, including attacks and stones into the urinary tract. Painless hematuria can also be as a result of many factors, including cancer.