Doctors may say you're "too old" for surgery, but what they actually mean is too frail.
After the tragic death of a young woman undergoing a cosmetic procedure, people are rightly asking who should be able to administer anaesthetics.
Author Kate Cole-Adams delves into fascinating questions about consciousness and self.
Some people can feel drowsy or can't concentrate days after an operation. While it's easy to blame the anaesthetics, the real picture is usually more complicated.
Terrifying accounts of surgery 200 years ago remind us how far general anaesthesia has come. Yet we still know little about how anaesthetics alter consciousness.