Why does a urinary tract infection cause pain and what does it reveal about the body's response?

Urinary tract infections (UTIs) are among the most frequent bacterial ailments globally, accounting for over 400 million recorded cases annually. The condition disproportionately affects young women, with nearly one in three experiencing at least one episode before the age of 24.

Beyond demographics, these infections frequently impact older adults and individuals with spinal cord injuries. Medical research into UTIs focuses on understanding why the infections generate physical pain and what the body's immune reaction reveals about overall biological defense mechanisms.