Left hand shaking, if it occurs occasionally, is mostly due to emotional tension and other psychological factors, and is a physiological phenomenon, which can be relieved quickly after most of the diversions and rest. If left hand trembling occurs frequently, the possibility of pathological factors should be considered. If the tremor is obvious during fine movements, it is mostly caused by primary tremor. If resting tremor occurs, consider the possibility of psychosis. In addition, left hand tremor can also occur when the left hand is fixed in one position for a long time and the local nerve is compressed.