Liu, a 63-year-old woman who is usually in good health, developed hematuria six months ago. Because it was painless and the hematuria disappeared automatically after a few days, she did not pay attention to it and did not go to the hospital. These days, hematuria appeared again and was sent to the hospital after being discovered by her family. The doctor arranged an ultrasound examination, which revealed bladder tumor, and further investigation of cystoscopy and CT confirmed that it was advanced bladder cancer, which had missed the best time for treatment, and Granny Liu regretted that she had delayed her condition. Clinically, the main causes of hematuria are urinary stones, inflammation, tumors, etc. There are also some rare diseases such as urinary tuberculosis and malformations. In patients with stones, hematuria is often accompanied by back pain, while in patients with inflammatory diseases, hematuria is often accompanied by urinary frequency, urinary urgency and urinary pain. In contrast, hematuria in tumor patients (including kidney cancer and bladder cancer) has no clinical symptoms, but because of the lack of clinical symptoms, it is easy to be ignored by patients; at the same time, hematuria can be intermittent and can reduce or stop on its own, which can easily cause the illusion that the disease has been cured, so that patients will not choose to actively seek medical treatment and eventually delay the best time to treat the disease. Experts remind that patients with painless hematuria, especially the elderly, are more likely to have urological tumors, and it is recommended to actively seek medical attention so as not to delay the treatment and increase the danger of tumors and the death rate.