How to detect bladder cancer as early as possible? Many people tend to think that the occurrence of hematuria is not painful and there is no physical abnormality, so there is no serious health problem. In fact, this is a wrong idea. Painless hematuria is often a sign of malignant tumor – bladder cancer. Ignoring painless hematuria can delay the disease. Hematuria is not a disease, but a precursor of many diseases. Most commonly, hematuria is caused by urinary stones or urinary tract infections. Other urinary tract diseases such as bladder cancer or kidney cancer can also cause hematuria. Hematuria caused by stones and urinary tract infections is often taken seriously by patients because of the pain and frequent urination, and they will seek medical attention in time. However, hematuria caused by bladder cancer is usually not painful, and the frequency of hematuria in early stage is very low, often only once in a few months, so it is easily ignored by many people. However, in fact, hematuria is a unique abnormal urination signal of bladder cancer. Compared with hematuria caused by other diseases, hematuria of bladder cancer has two characteristics: 1. Painless: when hematuria occurs, patients have no pain and other uncomfortable symptoms, until the cancer necrosis, ulceration and combined infection, then patients will have bladder irritation symptoms such as frequency, urgency and painful urination. 2.Intermittent: that is, hematuria occurs intermittently and can be stopped or reduced by itself. Two episodes of hematuria can be separated by several days or months, or even six months. This feature can easily make patients have the illusion that hematuria has improved on its own, thus missing the timely diagnosis and treatment. Electronic fiberoptic cystoscopy has fully replaced the traditional rigid cystoscopy, which is less invasive and causes little pain and discomfort to the patient. Keep away from risk factors The occurrence of bladder cancer has both intrinsic genetic factors and extrinsic environmental factors. Currently, two of the more obvious risk factors are smoking and long-term exposure to industrial chemicals. Smoking is the most certain risk factor for bladder cancer, and about 30%-50% of bladder cancers are caused by smoking, which can increase the risk rate of bladder cancer by two-fold to four-fold. Another important risk factor for bladder cancer is long-term exposure to industrial chemical products. About 20% of bladder cancers are caused by occupational factors, including those involved in textiles, dye manufacturing, rubber chemistry, pharmaceutical and pesticide production, paint, leather, and aluminum and steel production. Therefore, in order to reduce the occurrence of bladder cancer, it is recommended that smokers quit smoking as early as possible, while men over 45 years old should preferably have routine urine and urinary ultrasound during their annual physical examination to screen for tumors in the urinary tract.