There is no data to support the probability of malignancy of a single bladder tumor, so it is impossible to tell. The etiology of bladder tumors is currently unknown, and some studies have suggested that their occurrence may be related to factors such as smoking, long-term exposure to industrial chemicals, occupational environmental factors, and chronic infections. Bladder tumors are classified into benign and malignant tumors. Benign bladder tumors can be cured after treatment, but malignant tumors are prone to recurrence and metastasis after treatment. For malignant bladder tumors, the presence or absence of infiltration is one of the important prognostic factors for bladder cancer. Bladder malignant tumors can be metastasized through lymph or bloodstream, with local lymph node metastasis being the most common, and distant metastasis can be found in advanced stage, mostly in organs and tissues such as liver, lungs, bones and skin, which can cause corresponding symptoms. Benign bladder tumors usually do not recur, but malignant bladder tumors are more likely to recur, and patients should pay attention to the follow-up examination. It is recommended that patients with bladder tumors should go to the hospital in time, do relevant examinations, and follow the doctor’s instructions after clarifying the cause of the disease, so as to avoid delaying the condition.