Placement of double J tube may cause lumbar and abdominal discomfort, urinary frequency, urinary urgency, urinary pain, mild hematuria. For urinary stone surgery patients and ureteral stenosis and other patients often have to stay in the body of the double J tube, to play the role of drainage and expansion of the ureter, there is generally no obvious discomfort symptoms, some patients may experience lumbar and abdominal discomfort, urinary frequency, urinary urgency, urinary pain, mild hematuria. 1. Lumbar and abdominal discomfort: one end of the double-J tube is placed in the renal pelvis, and the kidney is in the lumbar abdomen, so there is a possibility of lumbar and abdominal discomfort. 2. Frequent urination, urinary urgency, urinary pain: Double J tube is placed in the urinary system, which has a certain stimulating effect on the bladder and urethra, and some of them will have symptoms of urethral irritation, which will be manifested as frequent urination, urinary urgency, and urinary pain. 3. Slight hematuria: placing double J tube is an invasive operation, if there is mucosal injury, hematuria may occur. Some patients may also have hematuria after activity. It is recommended to pay attention to rest, drink more water after the placement of double J tube, the general symptoms are not obvious, in addition, do not hold urine, avoid distance activities. At the same time, it is necessary to return to the hospital on time to remove the double J tube. If there is obvious pain, hematuria or fever after the placement of the double J tube, it is necessary to review the consultation in time.