Why are urinary tract infections more common in women?

Urinary tract infections (UTIs) are significantly more common in women than in men, with women being affected approximately 30 times more often.1

The primary anatomical factor contributing to this susceptibility is the length of the urethra. The female urethra is much shorter—measuring only about 4 cm (1.5 inches)—compared to the male urethra, which is roughly 18 to 20 cm (7 to 8 inches) long. This shorter distance makes it easier for microorganisms, such as bacteria, to travel into the bladder and cause an infection.12

Several other factors also increase the risk for women:
* Sexual activity: Intercourse can facilitate the transmission of bacteria, and the use of a diaphragm for contraception is associated with higher risk.1
* Pregnancy: Pressure on the urinary tract can lead to partial stagnation of urine, increasing susceptibility.1
* Menopause: Decreasing levels of estrogen can cause the vaginal epithelium to thin, reducing the body's natural defenses against bacterial invasion.1
* Biological factors: Some women may have specific antigens in the P blood group system that act as adhesion sites for bacteria, facilitating infection.1