The pain is caused by the dilation, stretching, and spasm caused by obstruction of the ureter, and is typically worse at the ureteropelvic junction and down the ureter, and subsides once the stone gets to the bladder.

疼痛因输尿管的扩张、牵拉、痉挛而起，通常结石位于肾盂输尿管交界处和输尿管下方时疼痛更为剧烈，一旦结石落入膀胱症状就消失了。