Gastrointestinal injury caused by caustic products a are relatively infrequent, occurring mainly in the upper gastrointestinal tract. Accidental ingestion accounts for most of the cases, and the severity and extent of damage produced, depends on the composition and volume of the caustic agent ingested; endoscopy is a safe and effective diagnostic procedure. We report four unusual cases of caustic injury of the gastrointestinal tract due to hydrogen peroxide, two cases due to oral ingestion and another two due to the accidental administration of enemas, there was a good clinic and endoscopic recovery with conservative treatment.