Generally speaking, arterial blood pressure in adults is considered to be hypotensive when it is equal to or lower than 90/60 mm Hg. Elderly people with blood pressure below 100/60 mm Hg are considered hypotensive, mostly in malnourished and poorly fit people, due to low blood pressure, slow blood flow and reduced blood flow in the cerebral vessels and coronary arteries of the heart, resulting in insufficient blood supply and causing ischemia and hypoxia. Most of the usual discussion is chronic hypotension, which means that blood pressure is chronically low and accompanied by symptoms such as dizziness, lightheadedness, weakness, and easy fatigue. Chronic hypotension can be divided into: 1. Somatic hypotension, mostly seen in women aged 20-50 years old and the elderly, can be asymptomatic in the milder cases, and mental fatigue, dizziness, headache, and even fainting in the more severe cases. The symptoms are more obvious in summer when the temperature is higher. 2. In upright hypotension, the patient’s blood pressure suddenly drops by more than 20 mmHg when changing from a recumbent to an upright position, or when standing for a long time, and is accompanied by obvious symptoms, such as dizziness, lightheadedness, blurred vision, weakness, nausea, cognitive dysfunction, palpitations, and pain in the neck and spine. A variety of diseases may cause upright hypotension, such as multisystem atrophy, diabetes, Parkinson’s syndrome, or other conditions such as: bedridden, frail elderly. 3, secondary hypotension, caused by certain diseases or drugs. Such as spinal cavernous disease, rheumatic heart disease, antihypertensive drugs, antidepressants, chronic malnutrition and hemodialysis, etc. 4, urinary hypotension (reflex hypotension), sudden fainting during or after urination, confusion, and return to normal 2-3 minutes after the attack. Mostly due to the sudden emptying of the bladder at night after full so that the abdominal pressure is suddenly reduced, the veins are dilated, the amount of blood returned to the heart is reduced, and the blood pressure drops. 5, drug hypotension, the elderly due to the disease taking antihypertensive drugs such as methyldopa, guanethidine, eugenol, valium, chlorpromazine, fenadine, dihydrocoumarin, tachyphylaxis, anti-anginal drugs such as hypothermia, nitroglycerin, etc. can also cause hypotension. Not pathological hypotension is generally not necessary to take antihypertensive drugs, as long as appropriate attention to nutrition, to ensure energy supply, adhere to participate in sports, blood pressure can gradually return to normal. The danger of hypotension: Hypotensive patients due to low intravascular pressure, resulting in slow blood circulation, distal capillary ischemia, which affects the supply of oxygen and nutrients to tissue cells, carbon dioxide and metabolic waste excretion. As the drop in blood pressure affects the blood supply to the brain and heart, the function of the body is greatly reduced, and the quality of work and life is subsequently reduced. To prevent hypotension can take the following measures: 1, appropriate to increase the amount of salt, while drinking more water, more water into the blood can increase blood volume, which can improve blood pressure. Exercise, enhance physical fitness, when you get up in the morning, you should slowly change your position to prevent a sudden drop in blood pressure; sleep with your head elevated at night to reduce the symptoms of hypotension; often shower to accelerate blood circulation, or alternate cold water and warm water to wash your feet. 2, increase nutrition, eat some tonic products conducive to regulating blood pressure, such as ginseng, astragalus, raw pulse drink, etc.. In addition, appropriate drinking some low wine can also improve blood pressure. Eat more easily digestible protein food, such as: chicken, eggs, fish, cheese, milk, etc., drink more soup, drink more water, and increase salt intake. 3, strengthen physical exercise, improve the body’s regulatory function. Physical exercise is good for both high and low blood pressure. 4, in order to prevent fainting to, elderly hypotensive patients should usually pay attention to the action should not be too fast and violent, from a lying or sitting position when rising, the action should be slower. Patients with urinary hypotension should also note that it is best to hold on to something stronger when urinating to prevent a fall. 5, drug therapy, blood pressure drugs dopamine, only when necessary to apply. In addition, the expansion of blood volume can help to raise blood pressure, but also the choice of adenosine triphosphate, coenzyme A, vitamin B and C, in order to improve the metabolic function of brain tissue treatment of hypotension include: 1, life should be slow, do not suddenly rise and lie down, the movement of turning position should be slow. 2, physical exercise long-term adhere to the morning and evening jogging or walking 20-30 minutes. 3, drug treatment when necessary to go to the hospital doctor will static point dopamine and so on. 4, dietary conditioning more food rich in high protein, sugar, lipids can be appropriate to eat more to increase the total calories.