The formation of hypertension may be caused by a variety of reasons, such as primary factors such as genetic factors, environmental factors, other factors, etc. It may also be caused by secondary factors, such as renal diseases, endocrine diseases, cardiovascular diseases, central nervous system diseases, other diseases, etc., which need to be analyzed comprehensively. 1. Primary factors: (1) Genetic factors: hypertension has obvious family aggregation, both parents have hypertension, the incidence of children is relatively high, the mode of inheritance may be gene dominant inheritance and polygenic association of inheritance two ways. (2) Environmental factors: diet, mental stimulation, smoking, etc., which is reflected in the high salt diet, high fat diet, alcohol consumption, obesity and other factors with relatively high prevalence rate. (3) Other factors: the prevalence of long-term oral contraceptives, ephedrine, and glucocorticoids is relatively high among normal people. 2. Secondary factors: (1) Renal diseases: such as glomerulonephritis, chronic pyelonephritis, polycystic kidney, renal artery stenosis, renal tumors and so on. (2) Endocrine diseases: such as cortisolism, pheochromocytoma, primary aldosteronism, hyperthyroidism and so on. (3) Cardiovascular diseases, such as aortitis, aortic stenosis, etc. (4) Central nervous system diseases: brain tumor, traumatic brain injury, etc. (5) Other diseases: drugs, erythrocytosis, long-term plateau environment hypoxia, etc.. So the formation of hypertension is relatively complex causes, found that elevated blood pressure, as early as possible to clarify the causes of high blood pressure, and targeted treatment.