Dementia is a term used to describe various different brain disorders that have in common a loss of brain function that is usually progressive and eventually severe. There are many types of dementia. The most common are Alzheimer's disease, vascular dementia and dementia with Lewy bodies.
The term 'dementia' is used to describe the symptoms that occur when the brain is affected by specific diseases and conditions.
Symptoms of dementia include -loss of memory -confusion and problems with speech and understanding.