Generally, erection after circumcision is not affected. The main purpose of circumcision is to remove the excess foreskin so that the glans can be exposed and to avoid harboring dirt at the foreskin. When performing circumcision, you only need to cut a small incision on the back of the penis and then cut off a circle of excess foreskin horizontally, which usually does not hurt the internal nerves and therefore will not affect the erection. If you have just finished circumcision, it is best not to let the penis erect, because at this time the incision is not completely healed, some patients even accompanied by mild edema of the head of the penis, erection may not only involve the incision to trigger pain, but also may affect the recovery of the incision. If you have problems with erection after circumcision, you should go to the regular hospital in time to find the cause and actively treat it.