Patient: Right kidney colic was found in April 2010 and there was hematuria in urine examination. ultrasound examination did not reveal kidney stones. The doctor at Putuo Central Hospital diagnosed kidney stones. On August 16, the right kidney had dull pain, and the ultrasound examination at Putuo Central Hospital diagnosed it as mild hydronephrosis, and no stone was found on the X-ray the next day. I don’t know if the hydronephrosis is caused by kidney stones, so I would like to ask the doctor to suggest treatment. Thank you! Ding Qiang, Department of Urology, Shanghai Huashan Hospital: Hello, we understand your condition. It should be said that most of the renal colic is caused by kidney stones falling into the ureter. We suggest you to have an intravenous pyelogram after 1 week of pain relief.