The main symptom of bladder cancer is hematuria. Most of the hematuria is due to tumor rupture and bleeding. The hematuria can be more or less, and when it is more, it can be seen with the naked eye, and when it is less, the red cells in the urine can only be seen under the microscope. In bladder cancer, the hematuria is usually the whole process of urination, that is, the blood color can be seen during the whole process of urination, and the color of urine will be deepened when the urination is about to be finished. There are also a few patients who start to urinate blood and then urinate clear, or start to urinate clear and then become hematuria. Compared with the hematuria caused by other diseases, the hematuria of bladder cancer has two characteristics. One is painlessness, that is, when hematuria occurs, the patient has no pain and other uncomfortable symptoms. However, in case of necrosis, ulceration and combined infection, bladder irritation symptoms such as frequent, urgent and painful urination may occur. Secondly, it is intermittent, that is, hematuria occurs intermittently and can be stopped or reduced by itself. Two episodes of hematuria can be separated by days or months, or even six months. This tends to give the patient the illusion that the hematuria has healed on its own and thus fails to seek timely medical attention. Painless hematuria is the most important sign of bladder cancer, and almost all patients with bladder cancer will have this symptom first. Once the symptoms appear, patients should seek medical consultation in time for early detection and early treatment, which can achieve better treatment results. If hematuria occurs only once or twice and the patient does not pay attention to it, just like the aforementioned Zhang, thinking that it is caused by old illness or fatigue or cold and is not a big problem, or mistakenly thinking that hematuria can be cured by itself and does not need further treatment, the best time for treatment will be lost.