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Dementia may be defined as a progressive and largely irreversible clinical syndrome that is characterized by global deterioration in intellectual function, behaviour and personality in the presence of normal consciousness and perception (1).
The most common types of dementia are:
Dementia is a progressive condition, which means that the symptoms will gradually get worse. This progression will vary from person to person and each will experience dementia in a different way - people may often have some of the same general symptoms, but the degree to which these affect each person will vary (2).
Many patients have preserved positive personality traits and personal attributes but the following features may become evident as the disease progresses:
Dementia can be divided into:
Several risk factors responsible for the development of dementia have been recognized (1).
The most common causes of dementia are age-related neurodegenerative processes. Dementia is becoming an increasing problem as the population ages.