Blood 20 days after surgery for prostate enlargement may be due to incomplete healing of the wound, secondary bleeding and other reasons. 1. The wound is not completely healed: the prostate wound needs about three months to heal completely, 20 days the wound is not completely healed, if there is obvious bladder spasm after the operation or combined with the wound infection and other stimulating factors, resulting in the operation of the wound blood vessel breaks the formation of thrombus embolus dislodgement, resulting in secondary bleeding. 2. Secondary hemorrhage: During the operation of prostate surgery, the trauma hemostatic measures are not proper, resulting in some small blood vessels are not completely closed, and secondary hemorrhage may be formed. If there is still blood after 20 days of prostate enlargement surgery, you need to go to the hospital, complete the relevant examinations, identify the specific causes, and then under the guidance of the doctor’s treatment.