Urinary tract infections (UTIs) are very common in women, babies and the elderly. The most common cause is a bacteria called Escherichia coli (E. coli), which usually lives in the digestive system and bowel. Infection can target the urethra, bladder or kidneys.
Urinary tract infections (UTIs) are very common – particularly in women, babies and the elderly. Around one in two women and one in 20 men will get a UTI in their lifetime.
The kidneys control the amount of water in the blood and filter out waste products to form urine. Each kidney has a tube called a ureter, which joins the kidney to the bladder. The urine leaves the kidneys through the ureters and enters the bladder. The bladder ‘signals’ the urge to urinate and urine leaves the body through a tube called the urethra.
The urinary system is designed to minimise the risk of serious infection in the kidneys. It does this by preventing the urine from flowing back up into the kidneys from the bladder. The majority of urinary infections are confined to the bladder and, while causing symptoms, are not serious or life threatening.
Types of urinary tract infections
UTIs are caused by micro-organisms or germs, usually bacteria. The different types of UTI can include:
- Urethritis – infection of the urethra
- Cystitis – infection of the bladder
- Pyelonephritis – infection of the kidneys.
Symptoms of UTI
Some of the symptoms include:
- Wanting to urinate more often and urgently, if only a few drops
- Burning pain or a ‘scalding’ sensation when urinating
- A feeling that the bladder is still full after urinating
- Pain above the pubic bone
- Blood in the urine.
Kidney infections are serious
If infection reaches the kidneys, prompt medical attention is needed. In addition to the general symptoms, a person with a kidney infection can also experience:
- Loin (lower abdominal) pain
- Pain in the back.
Micro-organisms are the cause
Urine is normally sterile, which means it doesn’t contain any bacteria, fungus or viruses. To infect the urinary system, a micro-organism usually has to enter through the urethra or, rarely, from the bloodstream. The most common culprit is a bacterium common to the digestive tract called Escherichia coli (E. coli). It is usually spread to the urethra from the anus (opening in the back passage).
Other micro-organisms, such as Mycoplasma and Chlamydia, can cause urethritis in both men and women. These micro-organisms are sexually transmitted so, when these infections are detected, both partners need medical treatment to avoid re-infection.
Some people are at greater risk of UTIs
Some people are at greater risk than others of developing UTIs. These include:
- Women – sexually active women are vulnerable, in part because the urethra is only 4 cm long and bacteria have only this short distance to travel from the outside to the inside of the bladder
- People with urinary catheters – such as the critically ill, who can’t empty their own bladder
- People with diabetes – changes to the immune system make a person with diabetes more vulnerable to infection
- Men with prostate problems – such as an enlarged prostate gland that can cause the bladder to only partially empty
- Babies – especially those born with physical problems (congenital abnormalities) of the urinary system.
Urinary abnormalities in children
Urine infection in a child needs to be investigated as it may indicate a more serious condition. The most common urinary system condition is vesico-ureteric reflux. This means the bladder valve isn’t working properly and allows urine to flow back to the kidneys, increasing the risk of a kidney infection.
Vesico-ureteric reflux and the associated infections can scar or permanently damage the kidney, and can also lead to:
- High blood pressure
- Toxaemia in pregnancy
- Kidney failure.
Although not always backed up by clinical research, some women have found the following suggestions useful in reducing their risk of developing urinary tract infections:
- Drink plenty of water and other fluids to flush the urinary system.
- Treat vaginal infections such as thrush or Trichomonas quickly.
- Avoid using spermicide-containing products, particularly with a diaphragm contraceptive device.
- Practice good hygiene.
- Go to the toilet as soon as you feel the urge to urinate, rather than holding on.
- Wipe yourself from front to back (urethra to anus) after going to the toilet.
- Empty your bladder after sex.
Seek medical attention
It is important to seek medical attention if a bladder or kidney infection is suspected. Early treatment of urinary infection can help to prevent the infection spreading to the kidneys. Infection which has spread from cystitis or pyelonephritis is a much more serious condition. Your doctor will test your urine to check which micro-organism is present. Urinary tract infections usually respond quickly and well to antibiotics.
Where to get help
- Your doctor
- Your local community health centre
- Kidney Health Australia Information Line Tel. 1800 4 KIDNEY (543 639), TTY users phone 1800 555 677 then ask for 1800 454 363
Things to remember
- A urinary tract infection is caused by micro-organisms, usually a bacteria called Escherichia coli (E. coli).
- The urethra, bladder or kidneys can be affected.
- Even though urinary tract infections are very common, treatment with antibiotics may be needed, so seek advice from your doctor.
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Kidney Health Australia
Fact sheet currently being reviewed.
Last reviewed: May 2011
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