Alzheimers disease is the more common type of the neurological disorder in which death of the brain cells, cognitive decline, and loss of memory. Where it involves the formation of plaques and tangles in the brain, Amyloid-beta is a key component of the brain plaques found during extent of Alzheimers disease. Symptoms includes reduced ability to remember information, Impairments to reasoning, Changes in behavior Personality the progression of Alzheimer in three main stages, preclinical, before symptoms appear, dementia, mild cognitive impairment. In some cases, genetic testing may be done. The people with APOE-e4 gene will have higher chances of getting this disease at the age of 55 years. By performing this test can indicate person having or developing the disease. The emerging biological tests make it possible to assess for biomarkers in people with the risk of Alzheimers. There is no known cure for Alzheimer. As the dead brain cell cannot be regenerated.