Dementia is a general term which is used to describe a person’s decline in mental ability severe enough to interfere with their daily life. Alzheimer's is the most common type of dementia. There are several symptoms of dementia. These include general long-term or short-term memory loss, word-finding difficulties, and impaired judgment. Those who suffer from dementia usually will have issues with their normal day-to-day activities. Typically, those who suffer from dementia require supervision in order to protect themselves and the people around them.