Avicenna (c.980 - 1037) offered this reasoning:
At times it may be necessary to induce abortion; that is, when the pregnant woman is young and small and it is feared that childbirth would cause her death, or when she suffers from a disease of the uterus or when a fleshy growth in the uterus makes it very difficult for the fetus to emerge. Also when the fetus dies in the womb of the woman. Know that when labour continues for four days it means that the fetus is already dead.
Methods of abortion could be dangerous to the women as well. Hippocrates had refused to use abortifacients because of the danger they posed to the mother. The early Church stated that women who abort a child should be exiled from the church. A synod in 314 modified that to 10 years of exile. The Church Father Basil the Great later softened that, saying it should be less if the woman shows repentance.
In another case, a woman was sentenced to death for aborting her child precisely because she did it with malicious intent to prevent her husband (whom she had come to hate) from having an heir. Roman law allowed that, if a woman were to do the same thing for the same reason but it post-divorce, then she should only be exiled.
The Church Father St. John Chrysostom criticized abortions, but gave the example of a sex worker who needed to abort a pregnancy or else she would lose her livelihood. He goes so far as to blame her male client, who was responsible for getting her pregnant, as the real murderer.
A 9th century Byzantine author of a biography of a Greek Patriarch Ignatios tells the story of a woman with a breech birth who is in intense pain. The doctors prepare for an embryotomy (removing the baby by cutting it into parts and removing them). The 6th-century Bishop Paul of Mérida, who trained as a doctor in his youth, doesn't scruple to perform an embryotomy to save a woman's life.
That late-term abortions can find their way into accounts of religious lives and can be justified by Christian saints suggests a very different attitude toward the health and safety of the mother than is sometimes taken these days.
Embrotomies would have been difficult for the surgeon and the patient. Let's talk next about some of the other surgical practices that were employed in the Middle Ages.