The process of kidney stone expulsion generally refers to the process of expulsion of kidney stones from the renal pelvis, through the ureter, bladder and urethra. Generally speaking, small kidney stones with a diameter of 6 mm or less can be expelled from the body on their own. Small stones in the kidney will be gradually discharged downward through the peristalsis of the ureter. If the patient is properly active, such as doing more rope skipping exercises, it will help to promote the discharge of stones as soon as possible. Through the ureter, stones usually enter the bladder. In the bladder, with the process of bladder urination, stones may fall into the urethra, and in the urethra, through the flushing of urine, it is possible to expel the stones out of the body. During the process of expulsion, kidney stones may irritate the mucous membrane of the urinary tract, causing painful symptoms, which can usually be relieved by medication.