Small writing disorder, or writing spasticity, refers to trembling fingers when writing, imprecise movements, and difficulty with small movements. Writing spasm is a symptom group that is caused by occupational factors that lead to spasms in the muscles of the hand over a long period of time, resulting in writing dysfunction. Writingspasm, also known as primarywritingtremor, is the most common form of motor tremor in adults, especially when writing tremor occurs, making writing difficult. This disease is more common clinically and refers to a hand tremor of 5 to 8 Hz that occurs when the patient is writing or doing writing actions, not accompanied by other dysfunctions Some patients have tremor that is not completely limited to writing actions, but can also have tremor when doing other similar tasks or using similar tools Therefore, it has been proposed that writing spasms can be divided into task-induced writing spasms and posture-sensitive writing spasms. 1. Diagnostic criteria (1) All patients have hand tremor, which leads to writing difficulties requiring skilled work with the (left or right) hand and the use of tools, but the tremor can also occur to a lesser extent. (2) Physical examination revealed tremors not only in writing but also in holding the hand in this posture. The upper extremity also had nonspecific motor tremors of smaller magnitude than the writing tremors. (3) Primary writing tremor can be divided into two types according to the presence of hand tremor in different situations, which is limited to tremor during writing, called task-induced type, and tremor when writing and maintaining writing posture, called posture-sensitive type. 2, exclusion criteria (1) there are abnormal involuntary posture performance such as dystonia posture. (2) There is clinical evidence of dystonia or manifestations of other neurological disorders, such as Parkinson’s syndrome.