What is Alzheimer’s disease? Alzheimer’s disease is a manifestation of brain dysfunction in the elderly and is characterized by mental decline, behavioral and personality changes. Typical clinical symptoms include memory, abstract thinking, disorientation, and reduced social activity. Types of Alzheimer’s disease: Alzheimer’s disease can be divided into three main types: Alzheimer’s disease, vascular dementia and other types of dementia. Causes of Alzheimer’s disease: Modern medical research has shown that immune, genetic and viral factors can be associated with the onset of Alzheimer’s disease, and that some Alzheimer’s diseases can originate from chromosomal abnormalities. It has also been shown that some rare cases of Alzheimer’s disease are associated with viral infections. The ten warning signs of Alzheimer’s disease: 1. memory loss, affecting daily living activities; 2. difficulty in handling familiar things; 3. confusion about time, place and people; 4. diminishing judgment; 5. often putting things in inappropriate places; 6. problems with abstract thinking; 7. emotional instability and abnormal behavior; 8. personality changes; 9. Loss of initiative; 10. Difficulty in understanding and expressing oneself verbally.