The reasons why women are prone to urinary tract infections are mainly caused by the special structure of the female reproductive system, the fact that female vaginal secretions are also a better medium for the use of bacteria to multiply more easily, and the slow flow of urine to form a mild effusion. Urinary tract infection, also known as urinary tract infection, is an inflammation of the urinary tract caused by pathogens growing and multiplying in the urinary tract of the organism and invading the mucous membrane or tissue of the urinary tract. Bacteria are the most common pathogens, while fungi, viruses, and parasites can also cause infections. What is the etiology of slow urine flow? It is generally believed that there are four ways of urinary tract infection: upstream infection, bloodstream infection, lymphatic tract infection and direct infection. 1, episodic infection: the vast majority of urinary sensation is caused by episodic infection. Under normal circumstances, the urethral opening and its surroundings are parasitic of bacteria, but generally do not cause infection. When the body’s resistance decreases or there is slight damage to the mucosa of the urethra, or the bacteria are virulent and have a strong ability to adhere to the mucosa of the urethra and travel upstream, it is easy to invade the bladder and kidneys and cause infection. Because the female urethra is close to the anus, and the female urethra is far shorter and wider than the male, the urethra of female babies is often contaminated by feces, so it is more likely to cause disease. 2, bloodstream infection: bacteria from the body’s foci of infection (such as tonsillitis, sinusitis, dental caries or skin infections, etc.) invade the bloodstream, reaching the kidney, first in the renal cortex to cause multiple small sores, and then, along the renal tubules spread down to the renal papillae and renal calyces, pelvic mucosa, but inflammation can also be from the renal papillae with minor damage to the papillary collecting ducts (such as crystalline damage in the urine) to start, and then spread up and down. The hematogenous route of infection is less common, less than 10%. Bloodstream infections are more common in newborns, or in patients with Staphylococcus aureus sepsis with bloodstream renal infections. 3, lymphatic tract infection: the lymphatic vessels of the lower abdomen and pelvic organs have most of the traffic branches with the lymphatic vessels around the kidney, and there are also lymphatic vessels communicating between the ascending colon and the right kidney. When inflammation of pelvic organs, appendicitis and colitis occur, bacteria can also infect the kidney from the lymphatic tract. This route of infection is much rarer, and there is debate as to whether this route of infection even exists. 4, direct infection: trauma or infection in the adjacent organs of the kidney, bacteria can directly invade the kidney to cause infection, but this is very rare clinically.