Dementia is a chronic or persistent disorder of the mental ability process caused by brain diseases or injuries marked due to personality changes, memory disorders and impaired reasoning. Dementia is not a specific disease. It’s a group of symptoms related with a decline in memory or other thinking ability skills enough to reduce a person’s ability activities. Various kinds of dementia are associated with particular types of brain cell damage in particular regions of the brain. Dementia is often incorrectly referred to as the impairment in cognitive function is commonly accompanied, and occasionally preceded, by deterioration in emotional control, social behaviour, or motivation.