Tremors are unintentional trembling or shaking movements in one or more parts of your body. Most tremors occur in the hands. You can also have arm, head, face, vocal cord, trunk and leg tremors. Tremors are most common in middle-aged and older people, but anyone can have them.
Tremors commonly occur in otherwise healthy people. Sometimes, however, nerve diseases such as Parkinson's disease or dystonia, an overactive thyroid, or certain medicines can cause them. Heavy drinking, because it kills certain nerve cells, can cause tremors, too. Some forms are inherited and run in families. Others have no known cause.
Sources
MedlinePlus - Tremor
