The causes of high blood pressure are categorized into primary and secondary. Primary hypertension is related to heredity, environment, body weight, and drugs; secondary hypertension is caused by certain identified diseases or etiologies, such as renal disease, endocrine disease, cardiovascular lesions, and craniocerebral lesions. 1. Primary high blood pressure (1) Genetic factors: hypertension has obvious family aggregation, if parents suffer from hypertension, the incidence of children will be high and high blood pressure will appear. (2) Environmental factors: long-term high sodium, low potassium diet, excessive salt intake in the diet; long-term heavy drinking. Prolonged nervousness, anxiety, anger, panic, depression, high stress psychological state, or irregular work and rest. Long-term active or passive smoking. (3) Weight factors: Obese or overweight people, or men with waist circumference greater than or equal to 90 centimeters, women with waist circumference greater than or equal to 85 centimeters, can also lead to increased blood pressure. (4) Drug factors: such as long-term use of adrenocorticotropic hormone, non-steroidal anti-inflammatory drugs, etc., can also cause high blood pressure. 2. Secondary high blood pressure It is mainly caused by diseases, and the common diseases include the following: (1) Kidney diseases: such as glomerulonephritis, renal artery stenosis, etc. (2) Endocrine diseases: Cushing’s syndrome, pheochromocytoma and so on. (3) Cardiovascular diseases: such as aortic insufficiency, etc. (4) Craniocerebral diseases: such as brain tumor, traumatic brain injury, etc. (5) Other diseases: such as sleep apnea syndrome, erythrocytosis and so on. It is recommended that people with high blood pressure should consult the hospital in time, and the specific diagnosis and treatment should follow the doctor’s advice.