The absence of hematuria may also be ureteral cancer. The cause of ureteral cancer is not clear yet, however, research shows that ureteral cancer is related to smoking, drinking coffee, abusing analgesic drugs, some special occupations, chronic inflammation, fluid retention, stones, using cyclophosphamide for chemotherapy, heredity and many other factors, and common symptoms include intermittent and painless hematuria, hydronephrosis, renal colic and so on. If there is no hematuria, it may also be ureteral cancer, which is mainly treated by radiotherapy, chemotherapy and surgery. For patients with high-grade tumors, cuff resection of the affected side of the kidney, the whole length of the ureter and the bladder can be used. For patients with side renal insufficiency, kidney preservation surgery is adopted. If there is any discomfort, it is recommended to go to regular hospitals in time for clear diagnosis and standardized treatment.