The greatest difference is that euthanasia deliberately ends a patient's life earlier than it would otherwise have ended; natural death may also "shorten" a person's life, but merely by refraining from using active, invasive resuscitation procedures, thereby allowing a terminally ill patient to die naturally.
安寧緩和醫療與安樂死最大差別在於，安樂死是刻意提早結束病人生命；自然死則未縮短病人生命，只是不作積極介入性的急救，讓末期臨終病人自然死亡。