What is the difference between euthanasia and suicide? This is tough to answer because the two concepts are very closely interlinked and the dividing line between them is very thin. Euthanasia denotes causing the death of incurable or terminally-ill patients; and the meaning of suicide is universally known. It is hard to imagine a legal system where the relatives of a patient in a vegetative state can decide to end his life while a fully competent adult is not allowed to end his own.
