Naturally discharging a 1cm stone may damage the ureter and even trigger uncomfortable symptoms such as blood in the urine and pain. When urinary stones occur, timely increase of drinking water and moderate physical exercise can promote the natural discharge of stones. While 1cm stones are large in size, when passing through the ureter, they may scratch the ureteral mucosa, resulting in ureteral bleeding with obvious pain. After the ureteral mucosa is damaged, it is less capable of resisting germs, and is also prone to urinary tract infections. Moreover, during the natural process of stone expulsion, the stone may be embedded in the ureter, which may lead to the symptoms of ureteral obstruction. The size of 1cm stone is slightly larger, and the natural expulsion of the stone may damage the mucosa of the ureter, so it is recommended that the patient consult a doctor in time and take a reasonable way of treatment under the guidance of the doctor.