Alzheimer's disease is the most common cause of dementia. Dementia is a collective name for progressive degenerative brain syndromes which affect memory, thinking, behaviour and emotion. The chemistry of the brain changes and cells, nerves and transmitters are attacked. Eventually the brain shrinks as gaps develop.

Symptoms may include:

Loss of memory
difficulty in finding the right words or understanding what people are saying
difficulty in performing previously routine tasks
personality and mood changes

Cognitive & Behavorial Symptoms

Cognitive Symptoms

Memory Loss
Disorientation
Confusion
Problems with reasoning and thinking

Behavorial Symptoms

Agitation
Anxiety
Delusions
Depression
Hallucinations
Insomnia
Wandering