It looks like inflammatory bowel disease, but it’s actually a celiac crisis

Celiac crisis is a very rare and potentially fatal complication of celiac disease. It usually occurs at the onset of celiac disease, but later onset is not uncommon. The age range for this condition is broad; most cases appear to occur around the first two years of life, although recent reviews place the median age at around 18 years, and it has also been described in adulthood. While there are no well-defined diagnostic criteria in pediatrics, it typically manifests as profuse diarrhea often accompanied by significant dehydration, electrolyte imbalances, hypoalbuminemia, lethargy, malnutrition, and even coagulopathy. Triggering factors are believed to include intercurrent infections, vaccination, surgery, or dietary indiscretions. The treatment is supportive, correcting dehydration, electrolyte imbalances and malnutrition, and may initially require corticosteroid therapy or total parenteral nutrition, making it necessary to restart enteral nutrition early and gradually to avoid refeeding syndrome.