Why do some people with inflammatory bowel disease relapse a lot?

Lots of reasons: Sometimes it is the disease itself. Sometimes, it is the treatment. Including wrong dose, med, inad duration. Some put people into remission, but not maintain it. Sometimes, it is poor compliance with prescribed treatments due to any number of reasons. Sometimes it is cigarette smoking. Sometimes, it is symptoms, but not the inflammation that has acted up. Other reasons as well.