If the bladder cancer still exists in the body without treatment, it can cause frequent blood in urine, and even the main symptoms of bladder cancer in the late stage are blood in urine and local pain, and some patients need blood transfusion because of hemorrhagic shock caused by severe blood in urine. If the volume of bladder cancer increases further and the degree of lesion worsens, it can cause necrosis of the tumor itself, and after necrosis, it can cause bleeding of the tumor. Bleeding is relatively mild, which is only manifested as red urine, but bleeding is more serious, which can form blood clot in the bladder, or the whole process of bright red hematuria. Some patients suffer from chronic blood loss due to long-term chronic hematuria, which is manifested as pallor, severe anemia, or even circulatory failure, and ultimately lead to loss of vital signs due to anemia or blood loss. Therefore, it is recommended to perform surgery as soon as bladder cancer is detected, so as to improve the quality of life of the patients and increase the survival rate.