When women develop a urinary tract infection, it can lead to blood in the urine. Urinary tract infections in women are usually caused by retrograde infections or bloodstream infections, with retrograde infections occurring more frequently. Retrograde infection usually refers to the invasion of external factors through the urethra to the bladder or renal pelvis, which in turn leads to urinary tract infections, where a large number of bacteria multiply in the urinary system and destroy the epithelial mucosa of the urinary tract, so that part of the blood component enters the urine and results in blood in the urine. Urinary tract infections not only have this clinical symptom, but may also have clinical manifestations such as frequent urination, urgent urination, pain and discomfort in the lower abdomen or pain and discomfort in the lower back, and even fever, weakness and nausea.