For patients who experience dizziness and dizziness when sitting up, the following points should be considered: First, the most common factor is upright hypotension, also known as postural hypotension, which is usually more common in the elderly population and is caused by atherosclerosis, poor elasticity and brittleness of the arteries and a dysfunction of blood pressure regulation. Secondly, if patients take certain drugs for a long time, they will also have the above-mentioned side effects, such as taking a large number of vasodilators, diuretics, antidepressants, etc., which will also cause the above-mentioned clinical symptoms. Third, if the blood volume is insufficient due to various factors, such as heat stroke in summer or acute gastroenteritis, nausea, vomiting too many times triggering dehydration, these conditions will also lead to the above-mentioned situation. Fourthly, if the patient has reduced regulation of internal environmental homeostasis, such as chronic heart failure and prolonged bed rest, the patient will also have the above clinical manifestations.