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Urinary Tract Infection
(UTI; Lower UTI)
by Julie Riley, MS, RD
A urinary tract infection (UTI) is an infection in any part of the urinary system. Most UTIs start in the lower urinary tract in the bladder or urethra. The urethra is the tube that carries urine out of the body. A UTI can also include an infection in the upper urinary system, including the kidneys.
There are different names for infections in different parts of the urinary system, including:
The infection may also occur in the tube connecting the bladder to the kidney (ureter). All of these infections are considered to be UTIs.
UTIs are caused by bacteria that most often come from the digestive tract or rectal area. The bacteria cling to the opening of the urethra and begin to multiply. If the infection is not treated right away, bacteria may move up the urinary system to the kidneys.
Most infections are caused by a bacteria that normally lives in the colon. The bacteria may move from the rectal area to the urethra.
UTIs can also be sexually transmitted. This type of infection usually does not spread past the urethra. Both partners need to be treated.
Risk Factors TOP
UTIs are more common in women because the rectum and urethra are close to each other, making infection more likely.
Other factors that may increase your chance of a UTI include:
UTIs may cause:
An infection in the kidney can be more serious. Call your doctor right away if you have symptoms of a kidney infection, such as:
Your doctor will ask about your symptoms and medical history. A physical exam will also be done. A sample of your urine will be tested for blood, pus, and bacteria.
In general, children and men are less likely to get UTIs. Their infections are more likely to be caused by structural problems of the kidneys, bladder, or tubes. As a result, children and men may need more testing to determine the cause of a UTI.
UTIs are treated with antibiotics. Standard medical care for a UTI includes taking antibiotics for 3 days. You will probably start to feel better after 1-2 days. It is important that you continue to take the entire course of medication, even if you feel better.
You may have your urine checked after you finish taking the antibiotics. This is to make sure that the infection is truly gone. If you have recurrent infections, you may be referred to a specialist.
The infection may cause pain and spasms in the bladder. Your doctor may recommend a medication called phenazopyridine. It may turn your urine, and sometimes your sweat, an orange color.
Severe UTIs may need a strong initial dose of antibiotics. You may be given antibiotics through an IV or an injection.
To help keep bacteria out of your urinary tract:
National Kidney Foundation
Urology Care Foundation
Canadian Urological Association
Women's Health Matters
American College of Obstetricians and Gynecologists. ACOG Practice Bulletin No. 91: Treatment of urinary tract infections in nonpregnant women. Obstet Gynecol. 2008;111(3):785-794. Reaffirmed 2016.
Bladder infection (urinary tract infection—UTI) in adults. National Institute of Diabetes and Digestive and Kidney Diseases website. Available at: https://www.niddk.nih.gov/health-information/urologic-diseases/bladder-infection-uti-in-adults. Accessed September 7, 2017.
Jepson RG, Craig JC. Cranberries for preventing urinary tract infections. Cochrane Database Syst Rev. 2008;(1):CD001321.
Pohl A. Modes of administration of antibiotics for symptomatic severe urinary tract infections. Cochrane Database of Syst Rev. 2007;(4):CD003237.
Uncomplicated urinary tract infection (UTI) (pyelonephritis and cystitis). DynaMed Plus website. Available at: https://www.dynamed.com/topics/dmp~AN~T116894/Uncomplicated-urinary-tract-infection-UTI-pyelonephritis-and-cystitis. Updated March 15, 2017. Accessed November 30, 2017.
Urinary tract infection (UTI) in men. EBSCO DynaMed Plus website. Available at: https://www.dyname.... Updated January 26, 2017. Accessed September 7, 2017.
What is a urinary tract infection (UTI) in adults? Urology Care Foundation website. Available at:
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Accessed September 1, 2015.
Last reviewed September 2017 by EBSCO Medical Review Board Adrienne Carmack, MD
Last Updated: 9/12/2016
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