The main reason for the occurrence of bladder cancer is very much related to the patient’s diet, and the diseases in the human urinary system are mainly related to drinking water, so it is necessary to analyze and understand the pathology in detail, so as to be able to face it in a better way. According to a report, the incidence of bladder cancer in men is second only to the incidence of prostate cancer, and bladder cancer can also induce other cancers, therefore, male compatriots should be vigilant against the occurrence of bladder cancer in the future life and work. “Holding in urine is one of the most important causes of bladder cancer.” Carcinogens in urine can attack bladder fibers and can destroy the normal structure of the cells to develop malignant changes. Even if you pass urine every hour compared to urine passed two or three hours apart, the latter urine will contain far more carcinogens. This means that the longer you hold your urine, the more likely you are to develop cancer, which is probably why men are much more likely to develop bladder cancer than women. Bladder cancer caused by smoking has accounted for 50-60% of its total occurrence. The risk of bladder cancer increases with the number of cigarettes smoked and the age of the smoker. Therefore, the first step to prevent bladder cancer is to stay away from tobacco. In addition, drinking more water and urinating regularly are the best preventive measures. A 10-year follow-up study of nearly 50,000 men aged 40-75 by researchers found that those who drank six large glasses of plain water a day had half the risk of bladder cancer than those who drank only one large glass. This may be because the fluid flushes carcinogens out of the body before they can act on the bladder, thus reducing the chance of attachment to the bladder wall. “A special note of caution is that water should always be boiled before drinking. Water temperature at 90 ℃, the carcinogens contained in the water fontanel hydrocarbons, chloroform content will rise, exceeding the national drinking water health standards by two times; and when the water temperature reaches 100 ℃, these two harmful substances will be evaporated with the evaporation and greatly reduced, continue to boil for 3 minutes, it is safe to drink. In addition, in terms of daily diet, people who often eat cruciferous vegetables, such as cabbage, cauliflower, radish, cabbage, greens, capers, and fresh fruits such as kiwi, fig, banana, jujube, etc. are more likely to stay away from bladder cancer. Hematuria is often the first symptom of bladder cancer. However, many people rashly think that hematuria is caused by urinary tract infection, kidney disease, urethral stone or prostate problem, and they do not take it seriously after misuse of antimicrobials to treat the problem effectively, thus delaying the diagnosis and treatment. Therefore, if unexplained hematuria occurs, it should not be taken lightly, and the cause should be clarified in time. If you have pelvic or lower back pain, painful urination, or slow urine flow, you should seek medical attention.