Essential tremor and how to manage it
This condition is less well known than Parkinson's disease, but it's far more common.
For many, the late actress Katherine Hepburn provided an indelible public image of essential tremor. Her quavering voice and trembling hands unmistakably betrayed the disorder. About 10 million people in the United States manifest symptoms of the condition, which variably causes the hands, head, and voice to shake.