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Huntington's disease (HD) is an inherited disorder that causes degeneration of brain cells, called neurons, in motor control regions of the brain, as well as other areas. Symptoms of the disease, which gets progressively worse, include uncontrolled movements (called chorea), abnormal body postures, and changes in behavior, emotion, judgment, and cognition. People with HD also develop impaired coordination, slurred speech, and difficulty feeding and swallowing.
The symptoms of Huntington's Disease usually appear between 30 and 50 years of age. But there are exceptions to this. About a quarter of the people affected by HD develop physical symptoms after they turn 50. This is much later than the usual age of onset for HD.