Dementia and Alzheimer's disease are two conditions that are often associated with cognitive decline and memory loss. These conditions can have a significant impact on an individual's daily functioning and quality of life. In order to properly understand and address these conditions, it is important to be aware of the common symptoms that may indicate their presence. Some of the most common symptoms of dementia or Alzheimer's include forgetfulness, difficulty with problem-solving and decision-making, confusion, and changes in mood or personality.