A lung transplant may be necessary if lungs are too diseased to function. Common causes of this are COPD, cystic fibrosis, sarcoidosis, and many more. One or both lungs may need to be replaced if all other treatment options have been exhausted. There are risks to having a lung transplant including organ rejection and infection. Once these obstacles are overcome, there is still a long road ahead. Follow the links below to find WebMD's comprehensive coverage about how lung transplants are performed, why they may be needed, risks involved, and much more.