[Neurological cardinal symptoms of internal diseases (author's transl)].

The old rule:"Frequent is frequent, Seldom is seldom" is only true of etiological entities. With symptoms and syndromes which are hastily diagnosed as "typical" or "atypical" just because they are frequent, serious misdiagnoses may occur and critical details both in the history and in the physical examination may be overlooked. The terminal reaction of the body, i. e. the phenomenological entities are a principium cognoscendi for the doctor as for the patient they are principium agendi which send him to the doctor. The task of the neurologist is to set out the neurological cardinal and warning symptoms as signposts for a satisfactory internist investigation and to a jointly controlled therapy.