In IBD Siren, IBD stands for inflammatory bowel disease. Siren signifies Siren’s song, as in it lures you in with goodness then destroys you. Coffee is one of these. Fun fact – coffee can cause diarrhea, light-headedness, and the shakes. It is poison during a Crohn’s flare and it is dangerous for anyone with IBD or IBS period. However, it’s so good, so who cares?