If a kidney stone passes through the ureter into the bladder, the painful symptoms caused by the stone will disappear. Because there is a large space in the bladder, there is no obstruction, so there is no fluid in the kidney and no spasm of the ureter, so there is no back pain or abdominal pain. After falling into the ureter and then into the bladder, most of the stones can be eliminated through the urethra. In rare cases, the stone may stay in the urethra and cannot be expelled, which may cause pain during urination or stabbing pain in the urethra, hematuria, straining to urinate, bifurcation of urination or bleeding from the urethra. Patients are advised to drink more water and urinate more often to get rid of the stones as soon as possible. It is also possible that the stones in the bladder flow with the urine, which then blocks the bladder outlet and can appear as a sudden interruption in the process of urination. When the patient changes position and the stone leaves the obstruction, urination returns to normal. This is called the phenomenon of interruption of urine flow and is also a manifestation of kidney stones falling into the bladder.