Alzheimer's Disease Alzheimer's Disease affects nerve cells or the brain and leads to memory impairment and loss of mental faculties. Alzheimer's Disease is characterized by memory lapses, confusion, emotional instability, and progressive loss of mental power. A person can have memory loss, a personality change, and become listless or confused once they have AD (Alzheimer's Disease). These are symptoms of a disease just like fever, vomiting, dizziness, and coughing are to other colds such as the flue. Sometimes damage to the brain, or an inherited factor, can cause it not to work as it should. This damage can be caused by injury, infection, or