Chemotherapy after bladder cancer surgery has certain damage to the body, but compared with systemic chemotherapy, the degree of damage is relatively low, and the damage includes: 1. Chemical bladder mucosal burns, the chemotherapy drugs infused into the bladder cancer have certain irritation to the mucosa, so the patient may have chemical cystitis after the infusion, which mainly manifests as frequent urination, urgent urination, small abdominal pain, accompanied by flesh eye The symptoms are mainly urinary frequency, urinary urgency, pain in the small abdomen, accompanied by hematuria, etc. Because bladder cancer surgery requires regular maintenance bladder perfusion chemotherapy, which is administered weekly, chemical cystitis lasts for a long time and is difficult to heal on its own, unless the bladder perfusion chemotherapy is stopped. 2. The symptoms may be related to the systemic reaction caused by the absorption of chemotherapy drugs.