Swelling after circumcision may be a normal phenomenon, and may also be caused by the surgical incision tear, infection and other factors. 1. Normal phenomenon: in the circumcision, will cause damage to the local blood vessels and lymph, there may be blood and lymphatic fluid leakage, in the postoperative period will be swollen symptoms, accompanied by pain, generally belong to the postoperative normal clinical manifestations. 2. Surgical incision tear: after circumcision, no good care, strenuous exercise or sexual intercourse, resulting in surgical incision tear, will make the local swelling, accompanied by severe pain. 3. Infection: poor hygiene after the operation, resulting in infection of the surgical incision site, can also cause symptoms of swelling, accompanied by pain, redness, pus. Swelling after circumcision, it is recommended to consult a doctor for examination and prompt treatment after clarifying the causative factors.