A double-attachment hysterectomy may cause red blood cells in the urine. Causes of red blood cells in the urine include urinary tract infection, intraoperative damage to the bladder, and urinary stones. 1. Urinary system infection: a catheter needs to be placed before double adnexal hysterectomy, which increases the possibility of bacteria entering the urinary system, thus causing bladder inflammation, urethra inflammation, etc., which makes red blood cells in urine. 2. intraoperative damage to the bladder: urinary organs and reproductive organs are located in close proximity to each other, and when performing double adnexectomy, there is a possibility of damage to the bladder blood vessels and so on, leading to the appearance of red blood cells in the urine after the operation. 3. Urinary stones: if the patient has stones in the kidney, ureter or bladder, the surgery causes the stone activity, so that the local mucosal tissues are damaged by friction, resulting in red blood cells in the urine after the surgery. It is recommended that patients go to the hospital in a timely manner to clarify the specific causes of red blood cells in the urine, if the abnormalities of timely treatment.