(adj.) Also spelled analogue, describes a device or system that represents changing values as continuously variable physical quantities. A typical analog device is a clock in which the hands move continuously around the face. Such a clock is capable of indicating every possible time of day. In contrast, a digital clock is capable of representing only a finite number of times (every tenth of a second, for example).
If you notice your hands are shaky when pouring a cup of coffee, holding a bridge hand or combing your hair, you may leap to the conclusion you are in the early stages of Parkinson disease. But actually, essential tremor is the most common form of abnormal trembling -- primarily of the hands.
A tremor is an unintentional rhythmic movement of any part of the body. When hands are shaking or trembling, this is typically a tremor of the hands. Tremors are usually caused by problems with areas of the brain that control movements. Neurological problems can cause tremors, but they can also be caused by metabolic problems and toxins (such as alcohol) that affect the brain and nervous system. Shaking hands and tremor can also be a side effect of medications. Shaking hands can occur as a solitary manifestation or can be accompanied by tremor or neurological disturbances in other parts of the body. Depending upon the underlying cause, shaking hands can be mild or severe, temporary or chronic.