Alzheimer's Disease Facts: Alzheimer's disease is a fatal brain disorder. Familial and sporadic are the two types of Alzheimer's disease. The three stages include early, intermediate, and late. Symptoms are dependant upon the stage of the disease, but include memory loss, inability to think, reason, judge situations, communicate, anxiety, agitation, disorientation, paranoia, severe memory loss, loss of mobility, delusions, and hallucinations. There is no cure for Alzheimer's disease, medications can be administered to control symptoms.