High and low blood pressure are related to heredity, age, dietary habits, diseases and other factors. 1. Heredity: Epidemiological studies have found that both essential hypotension and essential hypertension are inherited in families. If parents or grandparents have essential hypotension or essential hypertension, their offspring will have a higher risk of developing essential hypotension or essential hypertension. 2. Age: Generally speaking, young people have good elasticity of blood vessels, and the increase of blood pressure will be small; on the contrary, the older the age, the more the elasticity of blood vessels will be hardened, and the blood pressure will be high. 3. Dietary habits: Diet salty, often eat greasy food, fried food, spicy and stimulating food, addicted to smoking and alcohol, etc. can cause elevated blood pressure. And if the diet lacks, malnutrition, may trigger low blood pressure. 4. Diseases: For example, renal artery stenosis, pheochromocytoma, hyperthyroidism and other diseases can cause elevated blood pressure. And anemia, malnutrition and other factors, can lead to low blood pressure. In addition there are some obese patients, long-term mental stress patients can also cause high blood pressure. If you find abnormal blood pressure, you must consult a doctor in time, follow the doctor’s instructions for examination and treatment, do not leave it alone, so as not to cause serious consequences.