Many doctors believe that as long as patients with certain diseases can live more comfortably before they die, they should not artificially prolong their lives. People who voluntarily perform euthanasia can make a written statement before their death and authorize doctors to extend their lives without artificial means at the end of their lives. The legal effect of this will before its death is not consistent in all countries and regions of the world. For example, the "Right to Death Act" of the United States 1977 requires doctors to respect patients' wishes, and has been legislated in several states.

A vegetable is not a natural life, but a product of the high technology of the banquet house. Stopping giving life support to vegetative people does not mean killing life, just stopping making artificial "life". Moreover, whether this unconscious "life" is at the mercy of others is in line with the interests of patients, or even detrimental to their dignity, is still a question worthy of discussion. So some people think that the problem of vegetative state is not euthanasia, but the dignity of death. However, due to the influence of emotion and medical ethics tradition, it will still be difficult to deal with it.

With the development of science and technology, deformed babies that were difficult to survive in the past can survive with reliable advanced technology. Of course, their quality of life is low, and they may become a burden to society. Generally speaking, if a newborn baby is found to have serious physical or mental defects, modern medicine cannot remedy them, which will seriously affect the quality of life of the baby. In this case, and only in this case, when his legal guardian is unwilling to maintain his life, the doctor can accept the guardian's advice and stop his life maintenance measures, that is, the doctor can only implement and give advice on this euthanasia, and has no right to make his own decisions.