The double-j tube is used to drain urine after ureteroscopic surgery. If it happens to fall off on its own it may lead to infection, urinary tract obstruction, etc., and you will need to ask your doctor to reposition the double-j tube. Double j tube is usually placed at the ureter, can play the role of drainage of urine, can effectively prevent the occurrence of urinary tract obstruction, urethral stone and other conditions. If by chance the double J tube falls off, you need to consult a doctor, complete the relevant examination to determine the recovery of the condition, if necessary, need to re-placing the double J tube. After the placement of double J tube patients should pay attention to avoid strenuous exercise, usually drink more water, to prevent ureteral stones and other conditions. If the placement of double j tube after the physical discomfort or the occurrence of double j tube dislodgement, avoid unauthorized treatment, should promptly consult a doctor, ask for medical help.