Blood in urine, normal ultrasound suggests hematuria, divided into physiological and pathological two kinds. The former is seen in strenuous exercise, menstrual blood contamination, etc.; the latter is seen in urinary tract infection, nephritis and nephrotic syndrome. Physiological: strenuous exercise or menstrual blood contamination of urine, hematuria may occur, remove the relevant factors, hematuria may disappear. Pathological: urinary tract infection makes the mucosa of the urinary tract show inflammatory reaction, edema, bruising, destruction of small blood vessels, small blood vessel rupture triggers blood in urine, which cannot be observed by ultrasound. Nephritis and nephrotic syndrome patients glomerular basement membrane barrier function is impaired, the red blood cells extrusion deformation, destroyed from the urine outflow, manifested as hematuria, hematuria is mainly characterized by the whole process, painless, non-coagulation. Blood in the urine, ultrasound normal symptoms, it is recommended to go to the hospital in a timely manner, under the guidance of a professional physician to improve the examination, a clear diagnosis, timely treatment.