Parkinson’s tremor has the following characteristics: 1) it is a resting tremor, 2) the frequency is 4-6 Hz, and 3) it occurs mainly in the distal part of the limb or in the head. A resting tremor is a tremor that occurs when the patient’s hand is naturally lowered, placed on a table or on his or her knee, overcoming the force of gravity. Parkinson’s disease is mainly characterized by resting tremor, but in some patients, there is also some action tremor or postural tremor; its frequency is 4-6 Hz, that is, 4-6 times per second; it occurs in the distal limb, mainly in the hand tremor, which is imaginatively called pill-rubbing tremor, as if the patient is rubbing something in his hand; there is also a condition in which the patient may complain of feeling tremor inside the body, which may not be observed by the naked eye. This condition may not be observed by the naked eye and is called intrinsic tremor.