The role of the double J tube is placed in the ureter, to play the role of drainage of urine, double J tube extraction, bleeding, may be local tissue damage, may also be the urinary tract infection and so on. 1. Local tissue damage: double J tube in use, will produce stimulation of the local mucous membrane, in the process of pulling out, will also make the mucous membrane epidermal cells off, resulting in capillary rupture, bleeding situation. 2. Inflammatory infection: If there is an inflammatory infection in the urinary tract, the local mucous membrane will be ulcerated, and under the stimulation of pulling out the tube, bleeding will occur. Bleeding after the removal of the double J tube may also be due to other reasons, it is recommended to consult the doctor in time when this situation occurs, and under the guidance of the doctor to deal with the appropriate treatment, to prevent bleeding from aggravating the situation, which is detrimental to health.