Hypereosinophilia is defined by blood eosinophil count greater than 0.5 x 109 / L, it is a biological symptom which should not be neglected given the risk of visceral complications. However, any eosinophilia should be thoroughly investigated in order to define the etiology and treat it. Diagnosis of idiopathic hypereosinophilic syndrome HES can be retained after elimination of parasitic, allergic and haematological causes in the presence of a blood eosinophilia greater than 1.5 x 109 / L evolving over a period of at least six months and complicated by at least one visceral lesion. The visceral sites observed are not specific among which the cardiac and neurological attacks are the most dangerous compared to the other attacks: bronchopulmonary, liver, digestive, renal, cutaneous. We report an observation of persistent hypereosinophilia in a patient with exclusively digestive signs and the diagnostic difficulties encountered.