I've noticed there's a bunch of topics like this, but they're not exactly what I'm wondering about, so I'm asking a new question. I, too, have noticed my period causes a lot of disruption with my IBS. Yet, I don't have abdominal pain like most, so I don't get hit with that, but my constipation becomes chronic. On top of that, I have some odd symptoms. Headaches, overactive bladder-type feeling, highly increased appetite, and I think unfortunately, unintended weight gain from the new appetite. And all of this usually happens 7-14 days before my mensturation cycle, and most likely that makes the symptoms go away. So is the main cause most likely from my menstrual cycle or maybe my new appetite triggering IBS symptoms?