Patient: colic, difficulty in urination, drink a lot of water, urine volume is low, recently a stone the size of a grain of rice was discharged after the pain, laboratory tests, blood urine, no fever, no infection Because of the high cost of working abroad for medical treatment, Gu wants to wait for half a month to return to China for treatment, now I feel soreness in the back, occasionally still colic, sometimes strong and sometimes mild, I do not know whether it is hydronephrosis, need timely treatment, can delay half a month? Chen Rong, Department of Urology, Shanghai Sixth People’s Hospital: renal colic is mostly caused by urinary tract obstruction due to stones. When the attack occurs, there may be paroxysmal pain or soreness in the affected side of the waist or abdomen. Most of them can be relieved after antispasmodic and analgesic treatment. If there is no lesion in the contralateral kidney, the two-week waiting time is still acceptable. However, it is recommended to go to the hospital for examination and treatment as soon as possible.