Complications of a liver transplant can include rejection, an increased risk of infection, graft failure, biliary conditions and a higher risk of developing certain conditions – including some types of cancer. In up to one in every three people, the immune system attacks the new liver and stops it from working properly. This is known as rejection and it usually occurs in the weeks or months after a transplant. Rejection can occur without causing any specific symptoms, although possible signs can include: a high temperature (fever), vomiting, diarrhea, lack of energy, abdominal (tummy) pain, yellow skin and yellowing of the whites of the eyes (jaundice), pale stools, dark urine and itchy skin.