“The stomach should not be hit by any hard object during menstruation, as this might injure the uterus and cause a woman to vomit blood. This might also result in the development of ovarian cancer.”
What Vera Files found
Vomiting of blood after getting hit in the stomach is most probably due to a “severe damage” in the stomach or its surrounding organs, and, “in most situations,” does not involve or affect the uterus and the rest of the female reproductive system, said doctor Marjorie Santos of the Philippine Society of Maternal and Fetal Medicine. There is also no link between "falls, bruises, and broken bones" and cancer, according to the American Cancer Society.
Their words, from the summary they publish with the rating.
In short
This claim spread on social media. Vera Files (Philippines) looked into it and published its finding on 10 December 2020. Its rating was “False”.
This check was done by Vera Files, not by DoesItStand. We list it so you can find it. Their full evidence and reasoning are in their article.