A ureteric JJ stent is an essential therapeutic tool for urology. JJ stent migration, which is an essential complication, may be limited to the ureter or may cause pelvis/ureter perforation, intra-abdominal solid organ injuries, hematoma, and even life-threatening sepsis. A 33-year-old male patient had stage 3 hydronephrosis and 1.5 cm calculi in the proximal right ureter. During surgery, optimal visualization could not be achieved because of edema. 4.8 Fr 26 cm JJ stent was inserted and checked by scope. On postoperative day 1, plain urinary system radiographs (DUSG) showed that the distal part of the JJ stent was mobilized to the ureter and pulled back into place during reoperation. DUSG taken on postoperative day 1 of reoperation showed that the distal end of the JJ stent migrated to the ureter again. He was given symptomatic treatment, and the JJ stent was planned to be removed after 3 weeks. Postoperative third-week DUSG showed that the JJ stent had migrated entirely to the renal pelvis. He was operated on; calculi was broken with a laser lithotripter, and a new 4.8 Fr 26 cm JJ stent was inserted and checked by scope. The JJ stent did not migrate in the DUSG taken 3 weeks after the last operation of the patient. The best way to avoid JJ stent complications is to avoid unnecessary stent placement. The patient’s symptoms and complications should be considered when JJ stents are inserted. We found that a large calculus implanted in the ureter and hydronephrosis facilitated proximal migration of the JJ stent. The patient’s JJ stent should be checked postoperatively.