Kidney stones falling into the bladder can be determined by urinary CT or urinary ultrasound, as well as by clinical symptoms. Kidney stones, i.e., stones growing in the kidneys, can cause cramps or swelling in the lower back. Kidney stones can be perfected by urinary CT or ultrasound, and show up as a dense, high-density image on imaging. When a kidney stone falls into the bladder, the dense image in the kidney disappears and a dense image in the bladder can be found. Some smaller, smooth-surfaced kidney stones can pass through the ureter and into the bladder. When an isolated stone in the kidney enters the bladder, renal colic may be reduced or disappear, and may be characterized by intermittent interruptions of urination, i.e., discontinuous micturition, which is relieved by a change in position. When kidney stones are present, it is recommended to seek medical attention in time for a clear diagnosis and standardized treatment under the guidance of a doctor.