There are many reasons for writing brush hand trembling, such as improper posture, excessive force, etc. In addition, some disease factors can also lead to hand trembling, common causes include hyperthyroidism, idiopathic tremor, etc. A, non-disease factors: 1, the wrong posture: holding the pen or sitting posture errors, such as holding the pencil too high or standing to write, it is easy to hand trembling, you can adjust the posture, and gradually master the correct pen grip posture, will slowly improve; 2, too much force: some people just started to practice brush writing do not know the correct force technique, when the force should not force, there will be hand trembling. This is generally a normal physiological phenomenon, do not worry too much; 3, psychological factors: some people are too nervous, or to write the word without confidence, will also lead to hand trembling, which is also common. Relax before writing, do not rush, you can sit quietly for a while to avoid excessive tension and anxiety. Second, disease factors: hand trembling is also related to some diseases, such as hyperthyroidism, idiopathic tremor, cervical spondylosis, Parkinson’s, etc., there may be symptoms of hand trembling, if not actively treated, may make the development of the disease more and more serious, this situation must be promptly to the hospital for examination, to clarify the specific causes of the disease, targeted treatment.