What is a urinary tract infection?
A urinary tract infection (UTI) is a bacterial infection in
the urinary tract. The urinary tract includes the kidneys,
ureters, bladder, and urethra. Any or all of these parts of
the urinary tract can become infected. If left untreated,
UTI can cause permanent damage to the bladder and kidneys.
How does it occur?
Urinary tract infection is the result of bacteria that
multiply and spread. These bacteria can cause:
- cystitis (bladder infection)
- pyelonephritis (kidney infection)
- urethritis (inflammation of the urethra, the tube that
drains urine from the bladder).
Normally the urine does not have any bacteria or any other
organisms in it. Bacteria that cause UTI often spread from
the rectum or vagina to the urethra and then to the bladder
or kidneys. Urinary tract infection is more common in women
because the urethra is short. This makes it easy for
bacteria to move up to the bladder and kidneys. Sometimes
bacteria can also spread from another part of the body
through the bloodstream to the urinary tract.
An obstruction in the urinary tract, such as a stone, can
keep the urine from getting to the bladder and lead to an
infection. Urinary tract infection is more likely to occur
if you have diabetes or another disorder that affects the
immune system. Many women seem to have more infections
after sexual intercourse. As you get older, it can be
harder to empty the bladder completely. If the urine stays
in the bladder, the few bacteria that get into the bladder
can start growing and start an infection. Often the cause
of UTI is not known.
Urinary tract infection is more likely to occur in women
who:
- are newly sexually active or have a new sexual partner
- are past menopause
- are pregnant
- have a history of diabetes, sickle-cell anemia, stroke,
kidney stones, or any illness that causes the bladder to
be paralyzed or unable to empty completely.
What are the symptoms?
The symptoms of UTI may include:
- urinating more often
- feeling an urgent need to urinate
- pain or discomfort (burning) when you urinate
- strong-smelling urine
- pain in the lower pelvis, stomach, lower back, or side
- urine that looks cloudy or reddish
- shaking chills
- fever
- sweats
- nausea and vomiting
- leaking of urine (incontinence)
- change in amount of urine, either more or less
- pain during sexual intercourse.
How is it diagnosed?
Your health care provider will review your symptoms and
examine you. The exam may include a pelvic exam. Your
provider will check for tenderness of the bladder or kidney
area of your back. A sample of your urine may be tested for
bacteria and pus.
For repeated infections or symptoms that continue after
treatment, your health care provider may suggest:
- An intravenous pyelogram (IVP). An IVP is a special type
of x-ray of the kidneys, ureters, and bladder.
- An ultrasound scan to look at the urinary tract.
- A cystoscopy. This is an exam of the inside of the
bladder with a small lighted instrument. It is usually
performed by a specialist called a urologist.
How is it treated?
UTIs are treated with an antibiotic. For uncomplicated
urinary tract infections you may take a single dose of an
antibiotic or you may take an antibiotic for 3 to 10 days.
For chronic infections or infections that keep coming back,
it may be necessary to take the antibiotics for a longer
time. Take all the medicine your health care provider
prescribes, even after the symptoms go away. If you stop
taking your medicine before the scheduled end of treatment,
the infection may come back.
Your health care provider can prescribe a medicine called
Pyridium to relieve painful urination while the antibiotics
are treating the infection. (This medicine turns your urine
a dark orange color.)
If the infection is not treated, your kidneys may be damaged
or the infection may spread to your blood. If the infection
does spread to the blood, it can be fatal. If you have a
severe kidney infection, you will be given IV antibiotics
through your veins and you may have to stay in the hospital
for a few days.
How long will the effects last?
Usually the symptoms of the infection stop in 2 to 3 days.
How can I take care of myself?
- Follow your health care provider's treatment.
- Drink more fluids, especially water, to help flush the
bacteria from your system.
- If you have a fever:
- Rest if you have a fever above 100 degrees F
(38 degrees C). After your temperature falls below
100 degrees F (38 degrees C), you may be more active.
- Take aspirin or acetaminophen to control the fever.
- Keep a daily record of your temperature.
- A hot water bottle or an electric heating pad on a low
setting can help relieve cramps or lower abdominal or
back pain.
- Soaking in a tub for 20 to 30 minutes may help relieve
any back or abdominal pain.
- If your symptoms continue for 2 or more days, or if you
develop new symptoms, call your health care provider.
How can I help prevent a urinary tract infection?
You can help prevent UTIs if you:
- Drink plenty of water and other noncaffeinated drinks.
(Caffeine can cause the body to lose fluids.)
- Do not delay urinating when you feel the need to urinate.
- Use good hygiene when you use the toilet. For example,
wipe from front to back to keep rectal bacteria from
getting into the vagina and urethra.
- Avoid using irritating cosmetics or chemicals in the area
of the vagina and urethra (such as strong soaps, feminine
hygiene sprays or douches, or scented napkins or panty
liners).
- Urinate soon after sexual intercourse.
- Keep your genital area clean.
- Empty your bladder completely when you urinate.
- Wear all-cotton or cotton-crotch underwear and pantyhose.
Change underwear and pantyhose every day.


Disclaimer: This content is reviewed periodically and is subject to
change as new health information becomes available. The
information provided is intended to be informative and educational and is not a
replacement for professional medical evaluation, advice, diagnosis or
treatment by a healthcare professional.
HIA File URI5366F.HTM Release 9.0/2006. Copyright © 2006 McKesson Corporation and/or one of its subdiaries. All Rights Reserved.
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