The child's gastroduodenal ulcer is not uncommon. Its symptomatology is notably different from the adult's and gives it a rather original aspect. The pain is often atypical, almost permanent and its rythm is not necessarily related to the meals. The psychological context and the family background are almost always disclosed. The digestive hemorrhage is easily revealing. Radiological traps are to be known. The treatment is virtually always medical. Cimetidine has been used only in complications, in which it has appeared very useful. Surgery is not called for but in case of perforation or hemorrhage; then it is essentially preserving.