Mild symptoms may include: dizziness, headache, loss of appetite, fatigue, pallor, indigestion, motion sickness, etc. Severe symptoms include: upright vertigo, cold extremities, palpitations, dyspnea, ataxia, slurred pronunciation, even fainting, and the need for prolonged bed rest. These symptoms are mainly due to a drop in blood pressure, resulting in slow blood circulation and distal capillary ischemia, which affects the supply of oxygen and nutrients to tissue cells and the excretion of carbon dioxide and metabolic wastes. In particular, the blood supply to the brain and heart is affected. Differential diagnosis of intermittent dizziness: 1. Persistent dizziness: Generally, common acute dizziness disappears after one to two weeks at most, but persistent dizziness if it is maintained for more than a month. It can be caused by various factors such as brain diseases, anemia, and systemic diseases. 2, dizziness after strenuous exercise: dizziness after strenuous exercise is one of the clinical manifestations of anemia, which refers to the reduction of the total number of red blood cells in the circulating blood to below the normal value. However, since the technique of measuring the total red blood cells in the systemic circulating blood is complicated, clinically it generally means that the concentration of hemoglobin in peripheral blood is lower than the normal standard of the same age group, the same sex and the same region of the patient. The domestic normal standard is slightly lower than the foreign standard. In coastal and plain areas, hemoglobin can be considered anemic if it is lower than 12.5 g/dl in adult men and 11.0 g/dl in adult women. hemoglobin in children under 12 years old is about 15% lower than the normal value for adult men, and there is no significant difference between boys and girls. It is generally higher in areas with high altitude. Prevention: 1, physiological hypotensive state generally does not require special treatment, but should be followed up regularly, because some so-called physiological hypotensive state in certain circumstances, may be transformed into hypotensive disease, or may originally belong to pathological hypotensive disease, but early failure to detect the relevant pathological changes and mistaken for a physiological hypotensive state. 2, the treatment of primary hypotensive disease includes the following points: (1) diet nutrition should be given high nutrition, easy to digest and vitamin-rich diet: appropriate supplementation of vitamin C, vitamin B and niacinamide (vitamin PP), etc.. Appropriate consumption of coffee, cocoa and strong tea helps to increase the excitability of the central nervous system and improve the function of the vasodilatory center, which is conducive to raising blood pressure and improving clinical symptoms. In addition, the consumption of honey or royal jelly is also beneficial. (2) Appropriate participation in exercise and medical sports: such as medical gymnastics, health exercises, taijiquan, qigong, massage, and physical therapy can help improve cardiopulmonary function and raise blood pressure. (3) For the above treatment is ineffective: and the clinical symptoms are serious, a small dose of hormone can be used at your discretion, such as 9-a fludrocortisone 0.1mg/d to start, and gradually increase the dose according to the response to treatment, this drug has the effect of water and sodium retention, and raises blood pressure by increasing blood volume. If necessary, it can be supplemented with caffeine, ephedrine (15-30 mg, 1 to 3 times/d) and intramuscular injection of stilbene hydrochloride. In addition, symptomatic treatment can be given according to clinical symptoms.