Cramping after period, back pain and diarrhea what would cause it?

Hormone changes. These changes effect the blood supply to the pelvic organs which includes the lower colon. Also hormones effect the contraction of the colon.
Prostaglandins. Abdominal cramps and diarrhea are not uncommonly associated with your menstrual periods. These symptoms are related to prostaglandins, chemicals released from the cells lining the uterus during your period that cause the uterus and the intestines to contract. Prostaglandins can also cause other pain associated with menstrual periods, such as back pain and headache.

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