Dementia is a syndrome (a group of related symptoms) that is associated with an ongoing decline of the brain and its abilities. These include:
People with dementia may also become apathetic, have problems controlling their emotions or behaving appropriately in social situations. Aspects of their personality may change or they may see or hear things that other people do not, or have false beliefs. Most cases of dementia are caused by damage to the structure of the brain. People with dementia usually need help from friends or relatives, including help in making decisions.
There are various types of dementia. Some of which are listed on this website.
Personal views of what it is like to have dementia vary form person to person. Here are some: