A stone that has been stuck in the middle of the ureter for a month without pain may be caused by the stone staying in a non-obstructive area or by the stone having been discharged into the bladder.
Ureteral stones do not hurt, on the one hand, may be because the stone stays in the non-obstructive part, did not cause complete obstruction, urine can still be discharged through the gap between the stone and the wall of the tube, so there may not be obvious pain.
Ureteral stones can be examined and localized by X-rays and ultrasound, and if they are not expelled from the body, they can be removed by drinking more water and exercising more.
To summarize, if the stone is stuck in the middle of the ureter for a month without pain, you still need to be vigilant, and need to review regularly, if there is any discomfort, consult a doctor in time.