kidney stone
A kidney stone is a tiny mutiny of minerals that choreographs a performance of pain by crystallizing within the kidney. It asserts its presence only when traversing the urinary tract, issuing blistering pain as its passport. Though it signals a threat to life, its warning comes too late for those who feel it. Even when removed by tests and surgery, it relentlessly plots its own recurrence. As a grand trial of survival instinct, it lurks deep within the body, ever ready to strike again.