Urinary tract infection is the term given to any infection of part of the urinary system. The urinary system consists of the kidneys, the bladder, the ureters (tubes that connect the kidneys to the bladder) and the urethra (tube connecting the bladder to the outside world), and is responsible for excreting some soluble wastes from the body.
The kidneys act as filtration units to remove some of the body’s wastes from the blood, such as urea and ammonia, which are then passed from the kidney as urine. The urine passes through the ureters into the bladder and then leaves the body through the urethra.
Urinary tract infection (UTI) occurs when part of the urinary tract becomes infected, usually with bacteria, and is common in women who are sexually active. The most common type of UTI is known as cystitis (inflammation of the bladder). It has been estimated that one third of women experience the symptoms of cystitis at some point in their life.
Urine is normally free from germs and bacteria, however, the normal human body is covered with bacteria and the normal intestine contains enormous numbers of harmless bacteria. Urinary tract infections are usually upward-travelling infections that occur when some of the harmless bacteria from the intestine manage to get into the urethra and then travel up into the bladder.
This happens more commonly in women than in men, because women have a shorter urethra. Women who are sexually active are at higher risk of UTIs. Bacteria from the area around the anus are normally found all over the perineum (the area of tissue between the vulva and the anus), including the opening to the vagina and around the entrance to the urethra. In predisposed women, sexual intercourse helps the passage of these bacteria via the urethra into the bladder by a process of urethral massage.
If not treated, the infection may travel further from the bladder up the ureters to the kidneys.
When you have a UTI, the bladder and the lining of the urethra become red and inflamed. Common symptoms related to UTIs may include:
Some factors that may increase your likelihood of developing a UTI may include the following.
UTIs are usually treated with antibiotics. If your doctor suspects a UTI, they may test a sample of your urine to confirm the diagnosis, but often they will know you have a UTI from the symptoms you have.
If you have a UTI, your doctor will prescribe a course of antibiotics that should alleviate symptoms in a few days.
As with any course of antibiotics, it is important to complete the entire course prescribed by your doctor, even if you are no longer experiencing symptoms of a UTI.
Here are some tips for preventing UTIs.
Last Reviewed: 18 April 2009
You are under optimum weight for your height. Being underweight can carry health risks for both men and women. Check with your doctor or dietitian to find out if your current weight is healthy for you.
You have a healthy weight for your height.
You are over optimum weight for your height. You may be facing health problems, so losing some weight would be a good idea.
You are over optimum weight for your height. You may be facing health risks, so see your doctor to help you achieve a healthier weight.