You might have a familial tremor, which is usually a relatively benign condition, affecting movement or voice quality but seldom having any other effects. It involves a rhythmic, moderately rapid tremor (shaking) of voluntary muscles.
Purposeful movements may make the tremors worse. There may be difficulty holding or using small objects (such as eating or writing utensils). Emotional stress may also increase the tremors.
Over time, the tremors may affect the hands, arms, head, voice box (larynx), eyelids, or other muscles, but they rarely involve the legs or feet. In children, these tremors are usually limited to the hands and rarely require treatment.
The exact cause is unknown, but the fact that it is inherited suggests a genetic cause. It is usually dominant, which means about 50% of an affected person's children will be affected.
If you inherit one copy of the gene from either parent, you will have the disorder.