Different types of dementia have been associated with distinct symptom patterns and distinguishing microscopic brain abnormalities. Increasing evidence from long-term epidemiological observation and observation and autopsy studies suggests that many people have microscopic brain abnormalities associated with more than one type of dementia. The symptoms of different types of dementia also overlap and can be further complicated by coexisting medical or mental conditions.

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dementia Alzheimer's Mild Cognitive Impairment MCI Normal Pressure Hydrocephalus Creutzfeldt-Jacob disease Frontotemporal Parkinson's Lewy bodies Vascular mixed dementia confusion memory loss impaired judgement disorientation behavior changes trouble speaking strokes pattern of decline alertness fluctuation visual hallucinations muscle rigidity tremors fatal disorder coordination mad cow inability to control urine excess fluid shunt