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Prevalence: The prevalence of pressure sores reaches 10-20% in hospitalized elderly subjects. Higher rates are observed in units providing mid-term nursing. Rates recorded in long-term units are inversely lower. The prevalence of pressure sores in the elderly population living at home is poorly known., Favoring Factors: Very old age is a favoring factor due to associated diseases. Insufficient mobility, incontinence, undernutrition, mental disorders, and skin fragility increase the risk. All these factors must be taken into consideration when using risk scales to adapt preventive measures. NATURAL HISTORY: Pressure sores generally develop in the hospital, generally within one week of admission. For patients who do not die shortly thereafter, healing is generally achieved within 3 to 5 months. Pressure sores are a source of pain and infection. They also prolong the hospital stay. Overmortality is associated with pressure sores, basically resulting from the effect of comorbid states. COST: The economic impact of pressure sores is considerable but it is quite difficult to extract the individual cost of prevention, or treatment, from the overall cost of care due to the associated deficiencies and incapacities. It would be advisable to apply evidence-based protocols to reduce the incidence of pressure sores and also reduce the economic cost, both in terms of prevention and treatment.