Bridget Jones's Diarrhea
From Gomerpedia
Bridget Jones's Diarrhea is a 2001 romantic comedy in which Bridget Jones (played by Renee Zellweger) chronicles her neverending bout with loose stools. Hugh Grant plays her gastroenterologist.
Review
Dr. 99: I loved this movie so much that I now have a diary dedicated to my own bowel movements!