by 
The Curious Bag
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While bladder infections and other infections of the urinary tract are often associated with women, men can suffer from bladder infections as well. Some causes affect both sexes while some are specific to men.
Infection
Bladder infections in men typically stem from an infection that originates in the urethra. The bacteria spread to the prostate and along to the bladder. Bacterial prostate infections account for a majority of male bladder infections, according to Merck.
Enlarged Prostate
An enlarged prostate can press against the bladder; this interferes with proper urination and allows bacteria to multiply within the bladder.
Kidney Stones
Kidney stones commonly trigger bladder infection in men, according to the Mayo Clinic. Like an enlarged prostate, they prevent the bladder from emptying completely, leading to excess bacteria.
Narrowed Urethra
Urethral stricture---narrowing of the urethra---can also cause bladder infections in men. This narrowing might result from a catheter, surgery, infection or disease. This prevents bacteria from being completely flushed out.
Fistula
A vesicoenteric fistula (improper connection between the bladder and intestine) allows bacteria-laden fecal matter to enter the bladder, leading to a bladder infection in men, according to Merck.
Source:
Bladder Disorders: Bladder Infection Overview: Symptoms, Causes and Treatments
Mayo Clinic: Bladder infection in men: What are the symptoms?
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