12 years old child who is severely underweight and has digestive troubles for many years diagnosed with extremely low Hb 7.7, hematocrit 26 , Serum TTG IgA > 300 , but fecal calprotectin is very well in normal range. He was never getting constipated, but lot of burping (belching actually) and farting, and motions were usually disintegrated and lose texture, frequency is 2-3 in a day only. No stomach pain as such, except for times when motions would be more loose. What could be the reason? He has not been given deworming for the last 2 years, but all digestion issues described have been there for more than this time. What could be the possible causes? I want to preferably have diagnosis without an endoscopy as child is very scared to take up invasive tests.