[header] How to urinate after surgery [title] Empty your bladder completely before surgery. [step] Another thing that can help your bladder after surgery is making sure that you empty it before you go under anesthesia. You should urinate as close to going under as possible. 
Any urine left in your bladder during your surgery can make it harder to urinate afterwards. [substeps] While this can reduce how much you urinate after surgery, you will still urinate some.