Essential tremor is the most common movement disorder in humans, and its causes are among the most mysterious. It’s a neurological condition that causes involuntary shaking. It can begin in one’s 20s or 30s, or much later in life. Dr. Natalie Diaz treats essential tremors. Its origins may be unknown, but there are treatments. The first step is to talk to your doctor to rule out other forms of tremor because there are many.