Is Rice Flour considered a grain?
This is a great article, talks a bit about grains...
http://articles.mercola.com/sites/articles/archive/2010/05/27/gut-bacteria-offer-new-hope-for-people-with-celiac-disease.aspx?aid=CD945+
I too have had rib pain/costochondritis for 3 1/2 years. It's turned my life up side down. Just finally figured out that it's caused by my undiagnosed Celiac. SO thankful to finally get diagnosed. I'm finding that magnesium is helping the pain. I believe this pain is due to deficiencies due to Celiac malabsorption- as well as anything that irritates the stomach...