Bladder cancer patients can drink tea. Drinking tea does not increase the probability of cystitis, so it is not contraindicated. Bladder cancer may be related to hereditary factors, but it may also be related to prolonged exposure to industrial benzene substances, such as prolonged exposure to paints or benzene products, which can lead to an increased probability of bladder cancer. Long-term recurrent chronic cystitis causing bladder mucosa erosion and rupture, or adenocystitis may increase the incidence of bladder cancer. Squamous epithelial metaplasia of bladder mucosa caused by bladder stones may increase the probability of occurrence of squamous cell carcinoma, and smoking and prolonged exposure to radiation are also factors that increase the probability of occurrence of bladder cancer. The development of bladder cancer is a combination of factors, not caused by a single factor, but cystitis patients can drink tea in moderation and it will not significantly increase the probability of bladder cancer.