Blood in the stool after removal of a urinary catheter in an 80+ year old is usually due to damage to the urethra and bladder caused by the catheter. Retaining a urinary catheter is an invasive operation, in the process of retaining a urinary catheter or removing a urinary catheter, there may be irritation to the urethra, or to the urethra, bladder mucous membranes and other minor injuries, the local tissues spasm may appear painful symptoms, bleeding in the urine can occur, belonging to the removal of urinary catheters after the common complication. When bleeding occurs after removal of the urinary catheter, it is recommended to consult a doctor in time, to have the cause of the bleeding clarified by a specialist, and to actively carry out the appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.