Cramps occurring just before and 1 to 3 days during a period are completely normal. The pain typically is noticed in the lower abdominal area or in your lower back. These types of painful cramps are often associated with an upset stomach, vomiting and diarrhea.

Gastrointestinal havoc is common during your menstrual cycle. Bloating, nausea, diarrhea or constipation are the most frequent intestinal symptoms. The most common bowel change is diarrhea. It’s thought to be caused by the release of certain chemicals, primarily prostaglandins. Prostaglandins are also responsible for the cramps experienced during your period. These disruptive prostaglandins make the intestines and uterus contract causing diarrhea and menstrual cramps the first 3 days of your period.