Tremor is a clinical syndrome that mainly refers to the phenomenon of alternating, irregular and synchronized muscle contractions due to a variety of reasons, including non-disease factors and disease factors. 1. Non-disease factors: including some drug causes, such as taking sodium valproate, amiodarone, etc., may appear tremor performance; withdrawal reaction tremor, such as alcohol, drug withdrawal, etc.; emotional or environmental caused by, such as anxiety, fatigue, stress, cold and so on. 2. Tremor caused by disease factors (1) Neurological diseases: including Parkinson’s disease, multiple system atrophy and other neurodegenerative diseases. (2) Endocrine and metabolic diseases: such as hypoglycemia, hyperthyroidism, pheochromocytoma, hypercortisolism and so on. (3) Genetic diseases: such as idiopathic tremor, spinal cerebellar ataxia, hereditary mitochondrial disease, and other diseases related to genetic variation. (4) Toxic diseases: such as carbon monoxide, mercury, manganese and other toxic poisoning. (5) Psychiatric diseases: such as psychogenic tremor. Tremor is not a separate disease, but may be caused by a variety of factors, it is recommended to consult a doctor in a timely manner to clarify the cause of the disease and then targeted treatment.