Which type of abortion has no identifiable causes?

The correct answer is spontaneous abortion, which refers to a natural termination of pregnancy that occurs without any identifiable causes. This type of abortion is typically associated with early pregnancy loss, often resulting from chromosomal abnormalities, but it can happen in many cases where the specific reason is not clear.

Spontaneous abortion is known to occur in a significant percentage of pregnancies, especially within the first trimester, and frequently leaves healthcare providers and patients without definitive explanations as to why it happened. This lack of identifiable causes distinguishes it from other forms of abortion, such as elective and therapeutic abortions, which are induced through deliberate action based on various personal, medical, or social factors.

Elective abortions are performed at the choice of the patient for non-medical reasons, while therapeutic abortions are carried out for health-related reasons concerning the mother or fetus. Incomplete abortion refers to a situation where some pregnancy tissue remains in the uterus after a miscarriage or abortion, which can often be identified and requires medical intervention. Understanding the distinction between these types can help clarify why spontaneous abortion is characterized by its often mysterious onset.