The causes of sympathetic nervous disorder include psychosocial factors, genetic factors, biological factors and so on. 1. Psychosocial factors: If there is long-term mental tension, excessive psychological pressure and emotional ups and downs, it may cause sympathetic nervous disorder. 2. Genetic factors: If someone in the patient’s family suffers from sympathetic nervous disorder, the likelihood of the patient suffering from sympathetic nervous disorder will increase. 3. Biological factors: Brain infections, tumors, trauma, poisoning, nutrition and metabolism and other organic lesions can directly or indirectly damage the normal function and structure of the human brain, which will lead to sympathetic nervous disorder. Sympathetic nervous disorder can be manifested as increased heart rate, pupil dilation, elevated blood pressure, bronchial dilation, accelerated respiration and other clinical symptoms, which involves a number of systems and organs throughout the body. After the occurrence of sympathetic nervous disorder, the symptoms can be improved through treatment under the guidance of a doctor. It is recommended to relax the mind, have sufficient rest, quit smoking and drinking, eat a light diet, and exercise reasonably; you can also follow the doctor’s instructions to take nutritive drugs such as methylcobalamin, etc., to promote the relief of symptoms.