What GI problems qualify me for medical marijuana in Washington State?

First off I don't want any "drugs are bad" lectures. I smoke pot and it helps me. I smoked it before these issurs developed and i'll smoke it after they're cured (if they ever are) regardless of legality. Heres my question: I have gastro intestinal issues and I've found that marijuana helps it quite a bit. I am interested in getting my medical card so I can avoid arrest when obtaining/using my meds. What GI issues would qualify me for my med card?