history of respiratory distress and ab ingestis bronchial-pneumonia and at 2 years old, he underwent surgical intervention for ultra-short Hirshproung Disease. After the exclusion of neurological and otolaryngological causes, he underwent upper endoscopy, which showed two Mallory-Weiss bleeding tears of about 1.5 cm each. He was immediately admitted and received intravenous treatment with Omeprazole and Ampicillin/Sulbactam. After one week of hospitalization a control upper endoscopy showed superficial erosions till the middle oesophagus, improved over the last. Besides the oesophagus presented a “trachealized” aspect, suspicious for eosinophilic oesophagitis and an hyperaemic gastropathy at the body and at the antrum. However the histological report defined an eosinophilic gastritis. He, also, underwent a ileocolonoscopy that described a linfoid nodular hyperplasia and an severe inflammation of ileo-caecal valve, left-colon and sigmoid-rectum tract to complete the diagnosis. The eosinophilic infiltrate was also significant at the colic level. Finally, chest X-ray, brain RNM and abdominal ultrasound resulted negative while allergic test were positive to many allergens (kiwi, hazelnuts). Faecal research of bacterial and parasites were negative; the peripheral blood smear was negative for blasts. Between biochemical parameters, eosinophils were increased (12.6%) as well as ECP (200 μg/l) and triptase (3 μg/l). According to the allergologist, the child begin a steroid therapy at full dose, a diet restriction and stopped the assumption of Montelukast, because of the possible increasing of eosinophilia. At the moment, his clinical conditions are improved: he no longer vomits, his biochemical parameters are normalizing (eosinophils: 8.2%; ECP: 86 μg/l; triptase: 2.47 μg/l), the last upper endoscopy was showed no lesions and at the histology the eosinophilic infiltrate is decreasing. Discussion: EGIDs are a group of emerging disease, which manifestations can be unspecific and chronic, but also, like in this case, severe and sudden. More studies are needed to evaluate if there were conditions that could trigger the disease (eg. drugs -Montelukast-). Finally, we report this case because of the Mallory-Weiss Syndrome is a rarely complication of EGIDs.