Sudden blood in urine in women is not necessarily caused by cancer, some benign diseases may also cause sudden blood in urine in women. The sudden appearance of blood in urine in women is usually caused by acute urinary tract infection, because the urethra of women is straight, short and close to the vagina, so the chance of acute infection is significantly higher than that of men, so it is easy to have acute urinary tract infection, and the clinical symptoms are urinary urgency and frequency and pain, and then blood in urine. In addition, the phenomenon of blood in urine should be considered as a possible cause of urinary tumor or urinary stones bleeding, urinary tumor blood in urine is characterized by intermittent painless carnal hematuria, urinary stones blood in urine is often accompanied by severe lumbar pain and other symptoms, patients should go to the hospital as soon as possible for urinary routine, urinary ultrasound and CT examination to clarify the diagnosis, so as not to delay the disease. When the phenomenon of blood in urine occurs, patients need to drink more water to keep them well hydrated. If they have the urge to urinate, they should urinate as soon as possible and avoid holding urine in order to make their body recover faster.