Symptoms and Diagnosis of Alzheimer's Disease Find out about the symptoms of Alzheimer's and how the disease is diagnosed. Articles What Are the Signs of Alzheimer's Disease? Memory problems are typically one of the first signs of Alzheimer's disease. Learn about other common signs of mild, moderate, and severe Alzheimer's. Do Memory Problems Always Mean Alzheimer's Disease? Learn how to tell the difference between normal age-related memory loss and signs of a more serious problem like mild cognitive impairment or dementia. Sometimes, forgetfulness is caused by a treatable health condition. How Is Alzheimer's Disease Diagnosed? Doctors can diagnose "possible Alzheimer's dementia," "probable Alzheimer's dementia," or some other problem causing memory complaints. Learn about the benefits of early diagnosis. How Biomarkers Help Diagnose Dementia Learn about biomarkers — measures of what’s happening in the body — used in dementia detection and research, including brain imaging tests such as MRI and PET.