Alzheimer’s disease is a type of ‘dementia’. This term refers to a brain disorder that seriously affects a person’s ability to carry out daily activities. All of the known types of dementia involve disease processes that destroy brain cells. Alzheimer’s disease involves the parts of the brain that control thought, memory, and language. Although it is known that the disease process involves the appearance of abnormal clumps (amyloid plaques) and fibres (neurofibrillary tangles) in the brain of a person with Alzheimer’s disease, to date the cause of the condition has not been discovered, and there is no known cure.