As part of transplant week, we've filmed inside the Freeman hospital in Newcastle to see some of the patients waiting for an organ.
Families who donated their children's organs talk about their brave decision
Every year thousands of transplants are carried out, but a quarter of patients die because of a lack of donor organs.
Researchers at Newcastle University are conducting a pioneering study to make donated lungs more usable.
Currently only one in five pairs of lungs are suitable for transplant. But trials are being carried out to clean and aerate the organs after they've been removed.
It is hoped the research will save the lives of many patients on the lung transplant list.