Urinary tract infections (UTIs)

One in two women will get a urinary tract infection (also called UTI) in their lifetime. What causes UTIs, what increases your risk of getting a UTI, the symptoms, how it is diagnosed and what you can do to prevent further UTIs.

What is a UTI?

A UTI is an infection of the urinary tract that can affect the:

The female urinary tract

  • bladder (cystitis)
  • urethra (urethritis)
  • vagina (vaginitis)
  • kidneys (pyelonephritis)

One in two women will get a UTI in their lifetime. Nearly one in three women will have a UTI needing treatment before they are 24 years of age. The most common type of UTI in women is cystitis (infection of the bladder).

Causes of UTIs

UTIs are caused by bacteria (or germs) entering the urinary system, usually via the urethra (the tube that passes urine from the bladder to outside the body).

A number of things increase the risk of bacteria entering the urinary system including:

Infection from anus The urethra in women is quite short and close to the anus making it easier for bacteria (usually from faeces) to move up the urethra, enter the bladder and cause an infection.
Sex Frequent sex increases the risk of bacteria being moved around the genital area and entering the urethra.
Menopause The increase in UTI risk at menopause can be explained by the physical changes associated with menopause. As oestrogen levels drop, vulval tissue becomes thinner and drier, increasing the risk of irritation or abrasions that encourage infection.
Reduced pelvic floor strength Reduced pelvic floor strength affects bladder function because in some cases, the bladder does not completely empty, leaving a 'pool' of urine which can lead to infection.

Wearing a condom during sex does not cause a UTI and neither does wearing a tampon.

Who is at risk?

Women more at risk of contracting a UTI:

  • are sexually active
  • are approaching menopause
  • have diabetes
  • have urinary incontinence

Frequent UTIs in women need further assessment. High fever and pain in the back (kidney area) can indicate a kidney infection and this needs urgent medical treatment.

A partner is not at risk of catching a UTI if you have sex. However, the symptoms may be uncomfortable and you may not feel like having sex.


  • burning sensationBurning sensation when passing urine
  • Lower abdominal pain when passing urine
  • Passing urine more frequently than usual
  • Passing urine before you can get to the toilet (leaking or incontinence)
  • Feeling the need to urinate but not being able to, or only passing a few drops
  • Feeling like your bladder is still full, even after urination
  • Smelly urine or urine that is bloody, cloudy or darker than normal
  • Fever


A urine sample is taken and examined to see if an infection is present. Your doctor may also perform a physical examination.

If you have regular UTIs, you may need other tests such as an ultrasound of your kidneys to investigate further.

Management & treatment

UTIs usually respond well to simple treatment:

Treatment What it does What to do
Urinary alkalisers To relieve the pain and frequency of urination.
  • Make your own by dissolving one level teaspoon of baking soda in a glass of water
  • Buy a commercial alkaliser from a chemist
Water To flush the urinary system. Drink 6-8 glasses (1.5-2 litres) of water per day.
Antibiotics To fight the infection. See your doctor as soon as possible because the earlier you start treatment the better.

Although UTIs are easily treated with antibiotics, they can develop into more serious kidney infections if left untreated. If your symptoms persist for more than 24 hours and include fever, chills, back pain, nausea or vomiting you should see your doctor immediately. The symptoms should completely resolve within a few days once a course of antibiotics has started.  If this is not the case it's important to review with your doctor.

If you are pregnant and you think you have a UTI, see your doctor immediately.

How can UTIs be prevented?

  • Drink plenty of water to flush out the urinary system
  • Go to the toilet as soon as you feel the need so bacteria does not have the chance to collect
  • Wipe from front to back after going to the toilet to avoid transfer of bacteria from the anus to the urethra
  • Go to the toilet immediately after sex to reduce the movement of bacteria into the urethra and drink plenty of water so that you need to go again in a few hours
  • Some studies suggest that drinking cranberry juice or using cranberry products may offer some protection against UTI symptoms, however, conclusions from studies vary
  • It's best not to use douches or vaginal deodorants as these can irritate or create bacteria

Your doctor may recommend other treatments for you such as long-term antibiotics. Talk to your doctor about treatment options for you.

Last updated 20 July 2017 — Last reviewed 15 January 2014

** Currently under review **

This web page is designed to be informative and educational. It is not intended to provide specific medical advice or replace advice from your health practitioner. The information above is based on current medical knowledge, evidence and practice as at January 2014.

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