what causes of UTI?

Ok. Urine is usually free of bacteria. A urinary Tract Infection happens when bacteria gets inside your bladder, usually through your urethra the opening where urine comes out. Females have shorter urethras than males do, so it is easier for bacteria to enter the urinary tract and cause symptoms. The most common kind of UTI is a a bladder infection, which is called cystitis. If the infection affects your urethra, it is called urethritis. Plus if you don't drik alot of water that will give you one to.

I am not sure what causes them, but drinking cranberry juice or black cherry juice helps to prevent them.