Dementia is a set of symptoms, not a disorder. The dementia symptoms include loss of memory, judgment and reasoning, and changes in mood and behaviour. These symptoms may affect a person's ability to function at work, in social relationships or in day-to-day activities. Alzheimer's disease is the most common disorder that causes dementia symptoms. Other dementia disorders include, e.g., Vascular Dementia, Lewy body Dementia, Frontotemporal Dementia and Creutzfeldt-Jakob Disease. Sometimes symptoms of dementia can be caused by conditions that may be treatable, such as depression, thyroid disease, infections or drug interactions. If the symptoms are not treatable and progress over time, they may be due to damage to the nerve cells in the brain.
