What Causes UTIs in Women

UTIs are a key reason we're often told to wipe from front to back after using the bathroom. That's because the urethra -- the tube that transports urine from the bladder to the outside of the body -- is located close to the anus. Bacteria from the large intestine, such as E. coli, are in the perfect position to escape the anus and invade the urethra. From there, they can travel up to the bladder, and if the infection isn't treated, continue on to infect the kidneys. Women may be especially prone to UTIs because they have shorter urethras, which allow bacteria quick access to the bladder. Having sex can introduce bacteria into the urinary tract, too.

Symptoms of UTIs

To identify an UTI, keep an eye out for the following symptoms:

• A burning feeling when you urinate
• A frequent or intense urge to urinate, even though little comes out when you do
• Pain or pressure in your back or lower abdomen
• Cloudy, dark, bloody, or strange-smelling urine
• Feeling tired or shaky
• Fever or chills (a sign the infection may have reached your kidneys)

Tests and Treatments for UTIs

If you suspect you have a urinary tract infection, head to the doctor. You'll be asked to give a urine sample, which will be tested for the presence of UTI-causing bacteria. The treatment? Antibiotics to kill the intruders. As always, be sure to finish off the prescribed cycle of medicine completely, even after you start to feel better. And drink lots of water -- and cranberry juice -- to help flush the bacteria from your system. Your doctor may prescribe a medication to soothe the pain -- a heating pad may also be helpful.

Chronic UTIs

About 1 in 5 women experience a second urinary tract infection, while some are plagued incessantly. In most cases, the culprit is a different type or strain of bacteria. But some types can invade the body's cells and form a community safe both from antibiotics and the immune system. A group of these renegades can travel out of the cells, and then re-invade, ultimately establishing a colony of antibiotic-resistant bacteria primed to attack again and again.

Some women are genetically predisposed to UTIs, while others have abnormalities in the structure of their urinary tract that make them more susceptible to infection. Women with diabetes may be at higher risk, as well, because their compromised immune systems make them less able to fight off infections like UTIs. Other conditions that increase risk include pregnancy, multiple sclerosis, and anything that affects urine flow, such as kidney stones, stroke, and spinal cord injury.