Aside from menstruation, which condition is a common cause of non-traumatic vaginal bleeding?

Miscarriage is a common cause of non-traumatic vaginal bleeding aside from menstruation. It often occurs in the first trimester of pregnancy and can present with various symptoms, including cramping and spotting or heavy bleeding. A miscarriage happens when a pregnancy is lost before the 20-week mark and can be a natural result of chromosomal abnormalities or other factors related to the health of the mother or fetus.

Understanding the other conditions can provide context. Endometritis is an inflammation of the endometrium, usually due to infection, which can lead to bleeding but is less common than miscarriage as a cause of vaginal bleeding. Pelvic inflammatory disease (PID) typically arises from sexually transmitted infections and may also cause vaginal bleeding but is more associated with infectious symptoms. Endometriosis involves the growth of uterine tissue outside the uterus and can cause bleeding, although it primarily results in pain and other symptoms rather than bleeding as a primary issue.

Thus, miscarriage is recognized as a more prevalent cause of non-traumatic vaginal bleeding compared to the other conditions listed.