Abstract: Freedom of conscience is one of the fundamental rights of people, because it implies the human freedom and dignity that are above the State. This paper seeks to ponder on the right of objection and the bioethics in medical practice, as well as the way there are other aspects to be considered such as the Universal Declaration of Human Rights, the Official Mexican Regulation 046 (NOM-046-SSA2-2005) and the own right to conscientious objection.