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 5-8 Hz that occurs when the patient is writing or doing writing actions, without other functional impairments. Clinically, it is common in professionals who use their hands for long periods of time for fine manipulation, such as teachers, editors, secretaries, writers, painters, calligraphers, transcribers, draftsmen, typists, telegraphists, and piano players. The main manifestations are inflexible and uncoordinated fingers; spasmodic contraction of hand muscles or trembling of both hands or even trembling of the whole arm muscles, making the function of both hands impaired and unable to do fine work with the hands; typical intuition is seen in the difficulty of holding a pen, skewed writing, or in severe cases, inability to hold a pen and write. The condition is often triggered by excessive physical fatigue (especially hand fatigue), or stress. The more nervous you are, the more fearful you are of not being able to write well, and the more pronounced the spasm becomes. If you do other things that don’t require delicate manipulation of the hands, and you are calm, you will be able to operate with ease, and the spasms will be mild or even non-existent. The middle-aged and elderly are prone to Parkinson’s disease or cerebellar ataxia and other neurological disorders, and can have symptoms such as finger spasms or tremors. Patients with writing spasticity disorder have sensitive thinking, no facial hemiparesis, normal fertility, no muscle atrophy, normal sensation and normal reflexes, and no abnormality in brain CT examination, so they are easily distinguished from the above neurological diseases. Manganese poisoning can cause the occurrence of micro-writing disorder. This disease is mostly a neurological functional disease and some scholars believe that the disease belongs to extrapyramidal disorder or sympathetic reflex disorder. The most common type is hypertonia, in which the hand and wrist muscles spasm when writing, or the muscles are too weak to use the pen at will, similar to paralysis; there is also hyperkinetic type, in which the hand and wrist muscles tremble when writing, and gradually increase in mental tension, which is the result of the disorder of active and antagonistic muscles.