Micro-writing disorder, or writing spasticity, refers to tremors of the fingers during writing, imprecise movements, and difficulty with small movements. The disease is more common clinically and refers to a hand tremor of 5-8 Hz when writing or doing writing actions, not accompanied by other dysfunctions Some patients have tremors that are not completely limited to writing actions, but can also have tremors when doing other similar tasks or using similar tools Therefore, it is proposed that writing spasms can be divided into task-induced writing spasms and posture-sensitive writing spasms. The clinical diagnosis of micro-writing disorder: micro-writing disorder mainly occurs in people aged 20-50 years who have been engaged in writing for a long time, especially those who are engaged in writing, some patients have a positive family history Most patients have a slow and gradual onset of the disease Most patients feel easy fatigue in the fingers or wrist pain, followed by a characteristic writing spasm Patients have difficulty in holding a pen or starting to write This spasm phenomenon occurs mainly in the fingers, wrist and even the entire upper limb The most important feature of this disease is that the spasm does not occur during writing. The most important feature of this disease is that the spasm disappears when writing and not writing. The muscle strength is completely normal, sometimes only with pens or small pens alone, and completely normal with pencils or large pens. The patient can work normally without loss of use. The disease is mostly a neurological functional disorder, but in some cases, a high interphalangeal or wrist muscle tone can be seen during the examination. Clinically, writing spasm can be divided into three types: 1, spastic type (hypertonic type) is the most common type of writing quickly cause hand muscle wrist muscle spasm or alternating contraction state. 2, paralysis type (weak type) patients write with a sense of fatigue and weakness, because the muscle force is weak can not be arbitrarily dominated similar to the state of paralysis and can not use the pen, and sometimes pain along the nerve line. 3. Tremor type (hyperkinetic type) The tremor of the hand can be seen when writing, and it gradually increases with writing, especially under the influence of mental stress, which is the result of the disorder of the active and antagonistic muscles. Differential diagnosis: Primary writing spasms are generally considered to be a variant of idiopathic tremor, because the frequency of tremor is similar. Primary writing spasms, especially the task-induced type, usually remain relatively stable and remain confined to hand tremor, whereas primary writing tremor is also considered a variant of writing spasms, both of which are task-specific and to some extent also exhibit coarse tremor. The age of onset of writing spasms is 10 to 20 years younger than that of primary writing tremor.