Celiac Disease (gluten intolerance) is a chronic intestinal malabsorption disorder caused by gluten intolerance. Symptoms are caused by the protein in gluten called gliadin, which is found primarily in wheat. It's also in rice, corn, oats, rye, millet, and corn.
Symptoms usually appear during the first 3 years of life, once cereals have been introduced. A second peak of incidence occurs generally during your 30s.
Symptoms include:
Pale, greasy stools
Weight loss and signs of vitamin/mineral deficiency
Diagnosis is done by specialized blood tests and a biopsy of the small intestine.
You can also have food intolerances that are not caused by celiac disease. These can be determined by a specialized blood test.
Inflammation of the gallbladder (cholecystitis) is another thing you might want to look into. This is caused by blockage of the tube leading from the gallbladder to the duodenum. The symptoms of chronic cholecystitis are a dull but persistent ache on the right side of the abdomen underneath the ribcage. The pain is often brought on by eating, usually fatty foods.