Whether circumcision requires fasting is mainly related to the anesthesia method during the surgery, no fasting is required when local anesthesia is taken, while fasting is required for at least 4-6 hours if general anesthesia is taken. 1. Local anesthesia: In clinical circumcision surgery, local anesthesia is often used, including nerve block anesthesia at the root of the penis and local infiltration anesthesia of the foreskin, the anesthesia is only limited to the penis, and whether or not you are fasting doesn’t have any effect on the surgery itself, so you don’t need to be fasting. 2. General anesthesia: mainly used for pediatric circumcision, including intravenous general anesthesia and inhalation general anesthesia, due to the loss of consciousness of the patient during the operation, if the patient eats and drinks, nausea, vomiting, aspiration, etc., which may lead to life-threatening situation, so the patient needs to be fasting for at least 4-6 hours when the general anesthesia is given. To sum up, local anesthesia for circumcision surgery does not require fasting, while general anesthesia requires fasting, the details of which will be decided by the professional physician according to the patient’s condition, and whether or not to fast, please follow the doctor’s instructions to prepare for the surgery.