Essential tremor

Also known as: Benign essential tremor, Tremor
Tremor is an involuntary shaking movement that is repeated over and over. Although it may affect any part of the body, tremor most often affects the hands and head. Your voice may also shake. Occasionally the feet or torso may also shake.

Essential tremor, which sometimes runs in families, is one of the most common types of tremor. It is shaking that is most noticeable when you are doing something like lifting a cup or pointing at an object. The shaking does not occur when you are not moving. Medication can help reduce the shaking. Brain surgery can be helpful in some cases.
Gamma Knife is the most advanced radiosurgical tool available to treat a variety of brain lesions and disorders, including cancers of the brain. An alternative to invasive surgery, Gamma Knife Perfexion used at the Gamma Knife Center of Oregon focuses 192 independent beams of radiation on a single, precisely targeted location. With pinpoint accuracy, Gamma Knife can destroy tumors with no incisions, minimal blood loss and minimal damage to surrounding healthy tissue.