What causes an urinary tract infection?

Risk factors. These include indwelling catheters in the urinary tract, instrumentation, anything that could stagnate urine flow (like stones or obstruction), or abnormal flow of urine (reflux), depressed immunity, sexual intercourse (especially in women).

Related Questions

What can cause urinary tract infection?

3 ways. There are 3 ways that bacteria invade and infect the urinary tract, ascending, hematogenous and lymphatic spread. Ascending means bacteria ascend the urethra into the bladder. Hematogenous spread is when bacteria in the blood stream seed into the kidney tissue. Lymphatic spread is one way bacteria can get from the bladder into the kidney. The other is up the ureter. Read more...

What can cause a urinary tract infection?

Obstruction, trauma. A urinary tract infection also called as cystitis are common and usually uncomplicated except in pregnant females. Uti starts by colonization of vagina by colonic bacteria ; which then migrate and ascend into the bladder. Recurrent infections are more common in patients who have a abnormality of the urinary tract, kidney stones and or drug resistant bacteria. Read more...
Many causes. Utis are caused by bacteria getting into bladder and multiplying. Bacteria can enter during sex and hence reason to urinate after sex. Toilet hygiene, not wiping front to back, also keeping thighs closed which traps urine in vagina. Bubble-bath and tubs rather than showers. Thong and non-cotton underwear. Constipation. Withholding urination, drinking too little or urinating often enough. Read more...

What could cause a urinary tract infection in men?

Several things. The most common is incomplete emptying of the bladder because of an enlarged prostate. Read more...
Variable. There are multiple causes for a UTI in men depending on the age group. In younger men, it is usually from sexual activity or scarring in the urethra (stricture). In older men, it is usually from an enlarged prostate, urinary retention, bladder stones, or strictures. Read more...
Urinary stasis. Inadequate urine drainage favors urinary tract infection. Congenital abnormalities in urinary tract (upj obstruction, posterior urethral valve, vesicoutereal reflux), kidney stone, and enlarged prostate are examples. Read more...
Not normal in men... Though urinary tract infections commonly occur in women; since the urethra in men is longer and farther from the anus, uti's in men aren't common. However, uti's in men all require a work-up to find the underlying cause so it can be addressed: 1.Sexually transmitted infection, 2.Anatomical/physiologic cause (bacteria backwashes), or 3.Obstruction causing urine retention( e.g. Enlarged prostate). Read more...
Bacteria in urethra. Most utis are result of bacteria enering the urethra and working their way up to the prostae & bladder. Anthing causing urinary stasis or obstruction, like man enlarged prostae or urthral stricture will promote a uti. Chlamydia and mycoplasma can be sexually transmitted and cause utis. Uncircumcised, particulary men with poor hygiene, are more likely to get utis than those circumcised circumcised. Read more...