There are many causes of bladder cancer, especially the exposure to chemical substances and smoking are the most important ones, and to prevent the recurrence of bladder cancer, we need to pay attention to the following aspects: 1. usually have better living habits, better rest time, and ensure good rest after work; 2. try to avoid contact with places with more chemical substances, such as house decoration environment with high formaldehyde, workshop with many chemical substances, try to keep avoid staying in such environment for a long time; 3. Reduce smoking: smoking is more harmful, so it is repeatedly emphasized to reduce the intake of cigarettes to reduce the attack of bladder cancer. In addition, there are fewer signs in the early stage of bladder cancer, so timely treatment is more effective.