Dementia is a neuro-cognitive disorder that can be loosely explained as a loss of thinking ability and logical reasoning. This guide explains different forms of dementia. Dementia is a condition that makes someone unable to remember, think clearly, or make decisions while doing everyday activities. Alzheimer’s disease is the most common type of dementia. Learn about the different types of dementia. Dementia is not a specific disease. The word 'dementia' describes a set of symptoms that over time can affect memory, problem-solving, language and behaviour. Alzheimer's disease is the most common type of dementia. More than one type of dementia, known as mixed dementia, may exist together in at least 10% of dementia cases. The most common type of mixed dementia is Alzheimer's disease and vascular dementia, and the second most common is Alzheimer's and Lewy body dementia. Dementia involves a decline in the mental abilities you need for daily living. It develops when there’s damage to the parts of your brain involved with learning, memory, decision-making and language. Dementia is a loss of thinking, remembering, and reasoning skills. It is not a normal part of aging. Read about the different types of dementia and how it is diagnosed. Memory loss may be an early symptom of Alzheimer's or other dementia. Learn 10 warning signs and what to do if you notice changes like losing memory. Alzheimer disease is the most common form of dementia and may contribute to 60–70% of cases. Dementia is currently the seventh leading cause of death and one of the major causes of disability and dependency among older people globally. Dementia is a general term for loss of memory, language, problem-solving and other thinking abilities that are severe enough to interfere with daily life. Alzheimer's is the most common cause of dementia. Dementia describes a group of symptoms affecting memory, thinking and social abilities. The symptoms interfere with a person's daily life. Dementia isn't one specific disease. Several diseases can cause dementia. Memory loss is one of the early symptoms of dementia.