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Hi there. Huntington's disease is an autosomal dominant disorder, which means that a person needs only one copy of the defective gene to develop the disorder. You would have had to get it from one of your parents who got it from one of their parents, and so forth. If there is no family history of neuro problems you can essentially rule this out. Twitching like you describe, in the absence of weakness, cramping, atrophy, dystonia, speech or vision problems, is almost always benign. A condition known as BFS (benign fasciculation syndrome) is very common among otherwise healthy young men such as yourself, and is highly associated with health anxiety.