What is LBD? LBD is a progressive brain disorder with an average duration of 5-7 years. It is one of the most common types of progressive dementia, but is often mis or under diagnosed by clinicians, due to a lack of understanding and time constrains placed on clinicians for patient visits and evaluation. Symptoms and progression are thought to be caused by the build up of Lewy bodies in areas of the brain. The areas of the brain effected control an individuals overall functio