Anorexia, as a symptom, is part of the complex picture of a large pediatric pathology. Through attentive observation, anorexia as a single sign, may announce the onset of serious and particular affections. In all 4 cases, anorexia was a singular sign for a period of time before the complete illness was established. Whether adenoid cyst, cerebral abscess, pontocerebellar atrophy, Wilms tumor, neuroendocrine system of hunger regulation, satiety, complex control achieved through interactions of the limbic-hypothalamus-cortex system, come into operation with the occurrence of organic anorexia, different of the psychogenic anorexia (usually common in adolescents). The study is an alarm signal on the importance of a symptom in early diagnosis, and the rapid establishment of therapy in severe life threatening conditions.