Essential tremor is the most common movement disorder. It affects almost 3% of the population, about 1.4 million people in Spain. Although essential tremor is seen as a relatively benign disease, it can worsen patients' quality of life by limiting their ability to eat, dress and groom themselves, write, and carry out routine domestic and professional activities. Patients suffering from essential tremor may also find their social life impacted because of the visibility of the problem.
The cause of essential tremor is unclear, but cases often run in families (familial tremor). It has been estimated that approximately 50% of all cases are due to a genetic mutation, and the pattern of inheritance is most consistent with autosomal dominant transmission (i.e., the dominant trait).