The causes of high blood pressure in young people are divided into primary hypertension and secondary hypertension. Primary hypertension is closely related to genetic factors, environmental factors and lifestyle, and secondary hypertension is hypertension caused by certain diseases; high blood pressure in young people is mainly primary hypertension, which is manifested as mild or moderate elevation of blood pressure, usually without obvious clinical symptoms, and most early-onset hypertension is related to genetic factors. Secondly, it is closely related to environmental factors and lifestyle. The more overweight young people are, the greater the risk of developing hypertension or prehypertension. Obesity leads to metabolic disorders in the body, fat accumulation, and hardening of blood vessels, which leads to higher blood pressure. Losing weight through lifestyle changes will help reduce the risk of hypertension and therefore cardiovascular disease. Other causes include: One, high salt diet High salt diet tops the list of common factors for modern people suffering from hypertension, a healthy salt intake should not exceed six grams per day, but most people are more than nine grams, too much sodium will cause sodium and water retention, resulting in increased vascular volume, which ultimately leads to increased blood pressure. Second, bad lifestyle such as addiction to tobacco and alcohol, tobacco is harmful to blood vessels mainly from nicotine, nicotine will cause vascular smooth muscle contraction, resulting in increased blood pressure, while alcohol will make arterial vascular sclerosis, reducing the elasticity of blood vessels, ultimately leading to hypertension Third, high stress, mental tension High stress, mental tension will cause sympathetic excitation, vascular contraction leading to increased blood pressure. Common diseases that cause secondary hypertension are kidney disease, renal vascular disease, adrenal disease, etc. Renal diseases including acute and chronic glomerulonephritis, diabetic nephropathy, polycystic kidney, and chronic pyelonephritis are the most common secondary hypertension. Renal vascular hypertension is hypertension caused by unilateral or bilateral narrowing of the main trunk or branches of the renal arteries, and common causes include polyarteritis major and fibrous dysplasia of the renal arteries. Adrenal disorders include primary aldosteronism (excessive secretion of aldosterone by the adrenal cortex, a steroid hormone in the body that carries out sodium and water absorption and increases fluid in the body) and pheochromocytoma (excessive secretion of catecholamines, substances that constrict blood vessels, by chromophobic tissue in the adrenal medulla or elsewhere). Other causes include cortisolism and aortic constriction and obstructive sleep apnea syndrome. Cortisolism is mainly due to excessive secretion of adrenocorticotropic hormones leading to adrenocorticotropism or adrenocortical adenoma, which causes excess glucocorticoids; aortic constriction is mostly congenital and manifests as increased blood pressure in the upper arm without high or reduced blood pressure in the lower arm; obstructive sleep apnea syndrome is an important cause of intractable hypertension due to the elevation of blood pressure caused by continuous hypoxic stimulation during sleep. High blood pressure in young people has become a common disease, suffering from hypertension must find out the cause, clear primary or secondary, and at the same time to adjust their habits and timely diagnosis and treatment.