
Tremor
A tremor can be described as a rhythmic trembling or shaking movement that you cannot control voluntarily.
Tremor might be so mild that no one else notices it, or it might be more pronounced, causing a drink to spill when a cup is full, for example, or affecting handwriting.
For a small percentage of people, it is more severe, causing limbs to shake so that you need help with everyday tasks like eating and drinking.