Final answer:
Urinary tract infections (UTIs) can result from bacterial infections that colonize in the kidney or from bacteria that reach the bladder from the gastrointestinal tract. UTIs are not caused by viral infections, carelessness in handwashing, or spicy foods irritating the bladder wall.
Step-by-step explanation:
Urinary tract infections (UTIs) are bacterial infections of any part of the urinary tract. Bacteria are the most common cause of UTIs, especially in the urethra and bladder. UTIs can result from bacteria that have colonized in the kidney or from bacteria that reach the bladder from the gastrointestinal tract and multiply. UTIs are not caused by viral infections, carelessness in handwashing, or spicy foods irritating the bladder wall.