UTIs in women A UTI develops when microbes enter the urinary tract and cause infection. Bacteria are the most common cause of UTIs, although fungi rarely can also infect the urinary tract. E. coli bacteria, which live in the bowel, cause most UTIs.
The female anatomy contributes to women's increased likelihood of contracting a UTI. A woman's urethra is shorter than a man's, allowing bacteria better access to the bladder. A woman's urethral opening is also close to sources of bacteria from the anus and vagina. Sexual activity can move bacteria to the urethral opening.
Having bacteria in the bladder does not always mean there is an infection. Like the bowel, the bladder has bacteria and other microorganisms that help to keep it healthy and functioning properly.
Some forms of birth control also increase the risk of UTIs. Spermicides can cause skin irritations that allow bacteria to invade. Diaphragms may slow urinary flow, encouraging bacteria to multiply. Unlubricated condoms or spermicidal condoms may cause irritation, which can help bacteria grow.
The following factors also may encourage bacteria to grow: v Not drinking enough fluids
v Purposely holding in urine for long periods of time
v Spinal cord injuries or other nerve damage that makes the bladder difficult to empty regularly and completely
v Conditions or situations that block the flow of urine, such as a tumor, kidney stone, enlarged prostate, or sexual intercourse
v Diabetes and other conditions that reduce the ability of the body's immune system to fight off infection
v Catheters (tubes placed in the urethra and bladder to drain urine)
v Hormonal changes in the urinary tract of pregnant women that make it easier for bacteria to spread through the ureters and to the kidneys
