The Menstrual Poop.
In high school, I would get sent home on the regular for passing out from my debilitating menstrual cramps. Passing out would give me the same instant relief like throwing up or having diarrhea. I wonder if I can survive giving birth? Apparently, those cramps are caused by the body’s release of a chemical signal called prostaglandin, which signals the uterus to contract. Cramps result when the body produces a little bit too much prostaglandin, which can cause a contraction so strong, it cuts the blood supply to the uterus off. Ouch! I don’t experience those pass-out worthy contractions anymore, just slight cramping which I fully embrace because apparently, the excess prostaglandin has found its way to my anus, causing me to poop instead! So my body is now working with me, giving me the kind of relief I can appreciate.
Resources: Popular Science