General anesthesia is the most common type of anesthesia. Sometimes, people refer to general anesthesia as “going to sleep.” General anesthesia is performed by giving a patient medications through an intravenous (IV) catheter. Once those medications have been given, the patient quickly falls asleep. Once asleep, a soft breathing tube is inserted into the mouth to protect the airway. The patient doesn’t feel the tube, but he or she may have a temporary sore throat afterwards. Occasionally, people can be nauseous when they wake up. People generally feel groggy for a little after a general anesthetic.