Hand tremor in patients with Parkinson’s disease is called tremor in the diagnosis of Parkinson’s disease. Tremor is not present in all patients with Parkinson’s disease, and many patients with young onset do not have hand tremor. For Parkinson’s patients without tremor is predominantly tonic, some patients show tremor in early stages, some patients may have it in late stages, and some patients have tremor that is not too pronounced throughout the course of the disease. In the clinic, we may have to use some special tests that can detect some tiny tremor, and we can do tremor electrogram and tremor analysis. The absence of tremor does not necessarily exclude Parkinson’s, and in the clinic, the main thing is that Parkinson’s patients are slow in action, and both tonicity and tremor live in one, and both are one of the criteria for diagnosis. Therefore, in clinical practice, tremor is not necessary for Parkinson’s patients. Clinically, there are many Parkinson’s patients with tremor that is not obvious in the early stage, and then as the disease worsens, or the patient becomes tired, weak, or changes in mood, there are symptoms of mental factors that may cause the nervousness of psychogenic tremor accompanying Parkinson’s.