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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 movement disorders associated with Huntington's disease can include both involuntary movements and impairments in voluntary movements: 1  Involuntary jerking or writhing movements (chorea). 2  Muscle problems, such as rigidity or muscle contracture (dystonia). 3  Slow or abnormal eye movements.