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This is an accepted version of this page This is the latest accepted revision, reviewed on 28 February 2025. Long-term brain disorders causing impaired memory, thinking and behavior This article is about the cognitive disorder. For other uses, see Dementia (disambiguation). "Senile" and "Demented" redirect here. For other uses, see Senile (disambiguation) and Demented (disambiguation). Medical ...
Regarding incidence, cohort longitudinal studies (studies where a disease-free population is followed over the years) provide rates between 10 and 15 per thousand person-years for all dementias and 5–8 for AD, [235] [236] which means that half of new dementia cases each year are Alzheimer's disease. Advancing age is a primary risk factor for ...
Pre-dementia or early-stage dementia (stages 1, 2, and 3). In this initial phase, a person can still live independently and may not exhibit obvious memory loss or have any difficulty completing ...
1. Alzheimer's disease: know the symptoms. Alzheimer's disease "is an illness of the brain that occurs primarily in older people where brain cells start to die," Devi says.
The symptoms of Alzheimer's disease as a distinct nosologic entity were first identified by Emil Kraepelin, who worked in Alzheimer's laboratory, and the characteristic neuropathology was first observed by Alois Alzheimer in 1906. Because of the overwhelming importance Kraepelin attached to finding the neuropathological basis of psychiatric ...
Childhood dementia is an umbrella group of rare, mostly untreatable neurodegenerative disorders that show symptoms before the age of 18. These conditions cause progressive deterioration of the brain and the loss of previously acquired skills such as talking, walking, and playing.
Signs and symptoms are classified into three groups based on the affected functions of the frontal and temporal lobes: [8] These are behavioural variant frontotemporal dementia, semantic dementia, and progressive nonfluent aphasia. An overlap between symptoms can occur as the disease progresses and spreads through the brain regions. [14]
The term young onset dementia is becoming more widely used to avoid the potential confusion between early onset dementia and early stage dementia. This term is now used as presenile dementia which is a historical term of people diagnosed with dementia from a younger age of 51 years old. This is caused by an atypical arteriosclerosis of the brain.