What is dementia? Dementia should not be thought of as a single disease. It is a neuropsychiatric term that represents many different findings which are signs of a deterioration in the individual’s intellectual and social abilities. According to its definition the symptoms have to be serious enough to interfere with the person’s daily activities. The signs and symptoms of dementia can be caused by a variety of conditions. One of the most common form of dementia is called Alzheimer’s disease, which is a dementia that progresses over the years and leads to the loss of many abilities the patient used to have.