BH cramps are annoying AF!! Blame it on hormonal shifts you can point your finger at prostaglandins. Prostaglandins are lipids and hormone-like substances, released by the uterus during menstruation. They cause uterine contractions and menstrual cramps, she notes, which can mean that your rectal and bowel muscles can also contract and lead to pain. #womenshealth #periodcramps #momsover40 #menopause #comedy