Surgery is painful, and merely being asleep does not mean that you body will not unconsciously feel and react to the surgeon’s activities.
Although the nitrous oxide provides some pain relief, this is usually insufficient and your anaesthetist will use one or more of powerful analgesic drugs to ensure that your body does not feel pain.
He or she will select which ones to use, how much to administer and when to administer them on the basis of specialised training and experience.
Types of Pain
Pain relief after surgery