Hereditary geniospasm is a movement disorder that causes episodes of involuntary tremors of the chin and lower lip. The episodes may last anywhere from a few seconds to hours and may occur spontaneously or be brought on by stress. The episodes usually first appear in infancy or childhood and tend to lessen in frequency with age. Hereditary geniospasm is believed to be inherited in an autosomal dominant pattern. Although the exact gene(s) that cause the condition are unknown, it has been suggested that mutations in a gene on chromosome 9 may be responsible in some families.
Last updated: 6/5/2013
How might hereditary geniospasm be diagnosed?
Although we were unable to locate laboratories offering genetic testing for hereditary geniospasm, the condition can be diagnosed on the basis of a clinical evaluation performed by a health care professional such as a neurologist who specializes in movement disorders.
Another way to find movement disorders specialists is to connect with advocacy organizations that offer information and supportive resources for movement disorders such as, but not limited to, the group listed below.