Renal pelvis cancer is not the most serious of cancers. At present, there is no authoritative information indicating that renal pelvis cancer is the most serious type of cancer, whether renal pelvis tumor is serious or not depends on the nature of the tumor. Renal pelvis cancer is a relatively rare type of malignant tumor, with clinical manifestations of unexplained hematuria. Benign renal pelvis tumors are relatively rare, usually curable and not serious. However, almost all renal pelvis tumors are malignant. If detected early and treated aggressively, the prognosis is good. If detected late and the tumor has invaded neighboring organs, or lymphatic metastasis and distant metastasis have occurred, the condition will be more serious and the prognosis will be worse. When renal pelvis cancer occurs, it is recommended to seek medical treatment in time, follow the doctor’s instruction to do further examination, and actively cooperate with doctor’s treatment to improve the quality of life.