Many elderly people often find such a phenomenon: dizziness when standing up from the sofa, get up a moment will also be dizzy, even when getting up from the toilet will also appear dizziness, weakness, unstable standing, blurred vision and other symptoms, at this time, let people’s first thought is elevated blood pressure. However, a study by the University of North Carolina found that many people often get dark and dizzy when they stand up after sitting down, which is actually a medical condition called “postural hypotension”, also known as upright deficiency. Upright deficiency is a common clinical manifestation of impaired stability of the internal environment, seen in 15% to 20% of the general elderly. Its prevalence increases with age, the presence of cardiovascular disease, and the increase in basal blood pressure. Many older adults have a wide range of changes in blood pressure with changes in their posture and are closely related to their basal recumbent systolic blood pressure. That is, when the basal recumbent systolic blood pressure is highest, the postural systolic blood pressure drops the most, and the systolic blood pressure drops 320 mmHg (2.7 kPa) in the upright hypotension stance. Upright hypotension is an important risk factor for syncope and fainting in the elderly, even in those without other evidence of autonomic nervous system dysfunction. Diagnosis of upright decompensation: Most patients with upright decompensation often experience syncope, dizziness, dizziness, impaired consciousness, and blurred vision when they wake up suddenly or stand up after sitting for a long time. Fatigue, exercise, alcohol consumption or a full meal can aggravate the symptoms. Severe reduction of blood supply to the brain can lead to syncope or even coma. Doctors can make a diagnosis based on the symptoms. If there is a significant drop in blood pressure when the patient is standing and when the blood pressure returns to normal after lying down, the diagnosis of upright deficiency can be confirmed. Of course, further search for the cause of upright deficit should be conducted. If an elderly person complains of postural dizziness and mild confusion, the clinician should not assume that he or she is suffering from upright deficit. The blood pressure should be measured several times before starting treatment to confirm the persistence of upright deficiency.