Huntington's disease is a genetic disorder. It affects the brain and gets worse over time. This can lead to problems with moving, memory loss as well as thinking skills. Lastly, it also causes changes in behavior. Chorea is one of the main symptoms of Huntington's disease. On average, the disease leads to death about fifteen years after the first signs of the illness show. It is found in about 6 in 100,000 people. There is a 50% chance of inheriting this disease from the parents.