Researchers are unsure of the exact causes of Lewy Body Dementia. However, they believe that having abnormal amounts of Lewy bodies in the brain’s nerve cells leads to common symptoms. Lewy bodies are protein clumps that mainly consist of a protein known as alpha-synuclein. This protein has also been associated with Parkinson’s disease. While researchers have found genes connected to LBD, they still do not know how much genetics or lifestyle factors contribute to the disease.