[Fever in the elderly patient].

The multimorbid geriatric patient with age-related functional deficits is at particular risk from fever. Although the underlying cause is usually an infection, collagenosis, malignomas or drug-associated side effects all play an increasingly important role in patients of advanced age. In this segment of the population, the question of the reasonableness of a diagnostic work-up weighed against the expected improvement in quality of life is of particular relevance. The most common complication is dehydration, which may be followed by marked confusion. Account being taken of the requirements and the social situation of the individual concerned, any critical development should prompt early hospitalization, ideally in a geriatric hospital.