Idiopathic tremor may sound strange, but it is a common movement disorder in life and accounts for most of the “tremor disorders”, and its symptoms are easily confused with Parkinson’s disease, so it is more common to miss and misdiagnose. 1. Typical idiopathic tremor can be found in children, adolescents, middle-aged and elderly people. There are two views on the peak age of onset of the disease. One believes that the distribution of the age of onset is bimodal, i.e., in the age groups of 20-30 years and 50-60 years; the other believes that idiopathic tremor rarely develops in adolescents, and that the number of onset increases with age, with an average age of 37-47 years. 2. The only symptom of idiopathic tremor is tremor, occasionally accompanied by intonation and slight gait abnormalities. Patients usually start with the upper extremities, mainly affecting the upper extremities, and the onset of the disease is symmetrical bilaterally or unilaterally. Once the upper extremities are affected, they often progress upward to the head, face, tongue, and jaw. Involvement of the trunk and bilateral lower extremities is rare and only occurs late in the course of the disease, and to a lesser extent than the upper extremities. The frequency decreases and the amplitude increases with increasing disease duration and age. The typical symptom is rhythmic abduction of the hand with inward and flexion-extension-like tremor, and anterior and posterior rotational tremor (similar to Parkinson’s disease) is rare. Writing may be distorted, but does not manifest as underwriting. Another commonly affected area is the craniocervical muscle groups. The head, tongue, or vocal muscles can be involved, as evidenced by severe postural tremors of the patient’s hands and head tremors, including vertical “head nodding” and horizontal “head shaking” movements. Tremor of the soft palate and tongue can lead to vocal difficulties. 3. Tremor affects activity after 10 to 20 years of onset. It increases in severity with age and impairs the ability to perform fine activities, reaching a peak in the sixth decade after onset. 86% of patients can be affected by the age of 60-70 years in social activities and life skills, including writing, drinking, eating, dressing, speech and manipulation. The greater the amplitude of tremor, the greater the impact on mobility. There is no difference in the effect of tremor on gender. 4. Many factors can affect tremor. Hunger, fatigue, emotional excitement and temperature can aggravate tremor. As with most involuntary movements, idiopathic tremor resolves during sleep, and there have been isolated reports of tremor that persists in light sleep. The response to ethanol (alcohol) in patients with idiopathic tremor is characteristic. In many patients, the tremor can be reduced by ingesting even a small amount of ethanol (alcohol). 42-75% of patients have a reduction in tremor after drinking alcohol, but it is only temporary and usually lasts for 2-4 h. The tremor worsens the next day. There are few reports of similar effects of ethanol (alcohol) on other types of tremor, and ethanol (alcohol) acts through the center. 5. Idiopathic tremor can be accompanied by other disorders of movement disorders. Idiopathic tremor with Parkinson’s disease is well known. The prevalence of Parkinson’s disease has been reported to be much higher in patients with idiopathic tremor than in normal control populations, and even in patients with idiopathic tremor older than 60 years, the risk of Parkinson’s disease is 24 times higher than in a randomized population of the same age group.