urinary tract infection treatment
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Home Disease Index Urinary Tract Infection (UTI) 
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Overview

Causes
Symptoms
Risk Factor

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What is UTI?

 


A urinary tract infection (UTI) is an infection that begins in your urinary system. UTIs can be painful and annoying. They can also become a serious health problem if the infection spreads to your kidneys.

Women are most at risk of developing a UTI. In fact, one in five women will likely develop a UTI during her lifetime, and many will experience more than one.

The urinary system is composed of the kidneys, ureters, bladder and urethra. All play a role in removing waste from your body. The kidneys, a pair of bean-shaped organs in your upper-posterior abdomen, filter waste from your blood. Tubes called ureters carry urine from your kidneys to your bladder, where it is stored until it exits the body through the urethra. All of these components can become infected, but most infections involve the lower tract — the urethra and the bladder.



What are the causes of UTI?

 


Urinary tract infections typically occur when bacteria enter the urinary tract through the urethra and begin to multiply in the bladder. The urinary system has infection-fighting properties that inhibit the growth of bacteria and is designed to keep out such microscopic invaders. However, certain factors increase the chances that bacteria will enter the urinary tract, take hold and multiply into a full-blown infection.

Bacteria in the urine don't always signify an infection. Some people, especially older adults, may have bacteria in the bladder that don't cause any signs or symptoms or harm. This condition is known as asymptomatic bacteriuria.

Cystitis may occur in women after sexual intercourse. But even girls and women who are not sexually active are susceptible to lower urinary tract infections because the anus is so close to the female urethra. Most cases of cystitis are caused by Escherichia coli (E. coli), a species of bacteria commonly found in the gastrointestinal tract.

In urethritis, the same organisms that infect the kidney and bladder can infect the urethra. In addition, because of the female urethra's proximity to the vagina, sexually transmitted diseases (STDs), such as herpes simplex virus and chlamydia, also are possible causes of urethritis. Organisms that infect the urethra can easily spread to the vagina and cause an STD.

In men, urethritis often is the result of bacteria acquired through sexual contact. The majority of such infections are caused by gonorrhea and chlamydia.



What are the symptoms of UTI?

 


Symptoms differ, depending on whether the infection affects the lower (bladder and urethra) or upper (kidneys and ureters) parts of the urinary tract. The symptoms of lower urinary tract infectoin are dysuria (burning on passing urine), frequency (frequent need to pass urine) and urgency (compelling need to urinate). The urine can be cloudy with an offensive odour. In older men, generalised symptoms such as confusion and incontinence can be present. Urine infections are much commoner in the elderly, due to poor bladder emptying, an enlarged prostate, or incontinence associated with stroke or dementia.

The symptoms of upper urinary tract infection are the same as lower tract symptoms plus loin (flank) pain, fever and chills. The patient is likely to be ill and might require hospital admission.



What risks are associated with UTI?

 


Some people appear to be more likely than others to develop UTIs. Up to one in five women will develop a bladder infection over a lifetime. A key reason is their anatomy. Women have a shorter urethra than men have, which cuts down on the distance bacteria must travel to reach the bladder.

Some people appear to be more likely than others to develop UTIs. Up to one in five women will develop a bladder infection over a lifetime. A key reason is their anatomy. Women have a shorter urethra than men have, which cuts down on the distance bacteria must travel to reach the bladder.

Women who are sexually active tend to have more UTIs. Sexual intercourse can irritate the urethra, allowing germs to more easily travel through the urethra into the bladder. Women who use diaphragms for birth control also may be at higher risk. After menopause UTIs may become more common because tissues of the vagina, urethra and the base of the bladder become thinner and more fragile due to loss of estrogen.

Other risk factors include:
Anything that impedes the flow of urine, such as an enlarged prostate in men or a kidney stone
Diabetes and other chronic illnesses that may impair the immune system
Medications that lower immunity, such as cortisone in higher doses
Prolonged use of tubes (catheters) in the bladder.


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