Children with hydronephrosis 10mm should be treated according to the cause of hydronephrosis, congenital hydronephrosis is generally observed, for hydronephrosis caused by kidney stones can be treated with lithotripsy, and hydronephrosis caused by tumors is generally more serious. 1. Congenital hydronephrosis: the most common factor causing hydronephrosis in children is the stenosis of the renal pelvis and ureteral junction, congenital hydronephrosis 10mm is not very serious, belongs to the mild hydronephrosis, regular rechecking of b ultrasound, observation of the changes in the hydronephrosis, and then surgical treatment after aggravation. 2. Kidney stone hydronephrosis: 10mm hydronephrosis caused by kidney stones, it is recommended that patients go to regular hospitals for lithotripsy or lithotripsy, and the hydronephrosis will be improved after the operation. 3. Tumor hydronephrosis: tumor-induced hydronephrosis up to 10mm, the degree of hydronephrosis is more serious, the condition is more critical, it is recommended to consult a doctor in time for the treatment of the primary tumor, such as surgical resection, chemotherapy, radiotherapy and so on. In addition to the above causes of hydronephrosis in children, hydronephrosis caused by prostate hyperplasia is also seen. Regardless of the cause of pediatric hydronephrosis, it is recommended that the patient go to the hospital for further examination to assess the condition and then targeted treatment, to avoid delaying the condition.