Health care: medical care-health care common sense Normal blood pressure is generally based on brachial artery blood pressure. In a quiet state, the blood pressure of normal adults is relatively stable. Age blood pressure (systolic/diastolic blood pressure) mmhg 1 month 84/54 1 95/656 years old105/6510-13 years old1. 120/80 elderly people 140- 160/80-90 There are also gender reasons. The blood pressure of adult men is slightly higher than that of women by about 5±5 mmhg ... After menopause, the blood pressure of women gradually rises, similar to that of men. Blood pressure is usually the lowest in the morning, rising gradually during the day and reaching the highest in the afternoon or dusk. During exercise, cardiac output increases, blood pressure increases, and external temperature and blood pressure decrease. On the contrary, obese and overweight people have higher blood pressure and different postures. Blood pressure is different. At least three times of non-daily blood pressure, systolic blood pressure reaches or exceeds 140 and/or diastolic blood pressure reaches 90mmhg, which can be considered as hypertension. Whether for physiological or pathological reasons, systolic blood pressure below 100mmHg will lead to hypotension. Usually, the hypotension we discuss is mostly chronic hypotension. According to statistics, the incidence of chronic hypotension is about 4%, which can be as high as 10% in the elderly population. Chronic hypotension can be generally divided into three categories: ① Constitutional hypotension, which is generally considered to be related to heredity and emaciation, and is more common in women and the elderly aged 20-50. Mild people have no symptoms, and severe people have mental fatigue, dizziness, headache and even fainting. It is more obvious when the temperature is higher in summer. ② Postural hypotension: Postural hypotension refers to the sudden drop of blood pressure by more than 20mmHg when a patient changes from a lying position to a sitting position or an upright position, or when standing for a long time, accompanied by obvious symptoms, including dizziness, blurred vision, fatigue, nausea, cognitive dysfunction, palpitation and neck and back pain. Postural hypotension is related to many diseases, such as multiple system atrophy, diabetes, Parkinson's disease, multiple sclerosis, menopausal disorder, hemodialysis, postoperative sequelae, anesthesia, antihypertensive drugs, diuretics, sleeping pills, antidepressants and so on. Or other elderly people who have been bedridden for a long time and have weak constitution. ③ Secondary hypotension: hypotension caused by certain diseases or drugs, such as syringomyelia, rheumatic heart disease, antihypertensive drugs, antidepressants, chronic malnutrition and hemodialysis patients. Emotion, excitement, tension, fear, etc. Can excite sympathetic nerve and raise blood pressure.