What Is It?
Most urinary tract infections are caused by a variety of bacteria, including Escherichia coli (E. coli), found in feces. Because the openings of the bowel, vagina and urethra are close together, it's easy for the bacteria to spread to the urethra and travel up the urinary tract into the bladder and sometimes the kidneys. Urinary tract infections result in nearly 11 million office visits and 367,246 hospitalizations each year in the United States, according to the National Kidney Foundation. About 50 percent of women report suffering from urinary tract infections at some point in their lives.

Luckily, most urinary tract infections are not serious and can be easily treated with antibiotic medications. The symptoms of a urinary tract infection can be stubborn and can persist after treatment. Sometimes an infection recurs a few weeks after treatment. Nearly 20 percent of women who have a urinary tract infection will have another, and 30 percent of those who have had two will have a third. About 80 percent of those who have had three will have a fourth. If left untreated, urinary tract infections can lead to other more complicated health problems so they should not be ignored.

How the Urinary Tract Works
Your urinary tract includes two kidneys, two ureters, the bladder and the urethra. Your kidneys remove waste and water from your blood to produce urine. Urine travels through muscular tubes, called the ureters, to the bladder. The bladder is a balloon-like organ composed of muscle, connective tissue and nerves that swells as it fills with urine. Urine is stored in the bladder until it is released from the body through another tube, called the urethra. Two muscle groups, the pelvic floor muscles and the urinary sphincters, control the activity of the urethra and bladder neck. These muscles must work together to hold urine in the bladder most of the time and allow the bladder to empty when appropriate.

Cause of Urinary Tract Infection: Bacteria
Most urinary tract infections are caused by a variety of bacteria, including Escherichia coli (E. coli), found in feces. Because the openings of the bowel, vagina and urethra are very close together, it's easy for the bacteria to spread to the urethra and travel up the urinary tract into the bladder and sometimes up to the kidneys.Infection occurs when the bacteria cling to the opening of the urethra and multiply, producing an infection of the urethra, called urethritis.

Untreated Urinary Tract Infections: Bladder & Kidney Infections
The bacteria often spread up to the bladder, causing a bladder infection, called cystitis. Untreated, the infection can continue spreading up the urinary tract, causing infection in the kidneys, called pyelonephritis. Pyelonephritis can also occur without a preceding bladder infection.

A kidney infection that is not treated can result in...

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