Euthanasia refers to actions or omissions that cause a person's death in order to end suffering. There are two main types: active euthanasia directly ends a person's life through lethal injection for example, while passive euthanasia allows a terminally ill person to die by foregoing life-prolonging treatment. The Church teaching is that active euthanasia is morally unacceptable as it constitutes suicide or murder, but that foregoing extraordinary or disproportionately burdensome treatment is permissible as long as the intention is not to cause death.