There are two main reasons for dizziness when standing up: first, upright hypotension, which is mainly seen in young thin women, their own blood pressure is low, when standing up, especially when the movement is relatively large, relatively fast, it is easy to cause a drop in blood supply to the brain and the symptoms of dizziness, after sitting and lying down, this dizziness can be effectively relieved. Second, it may be due to abnormalities in the heart, cervical spine and cranial brain, such as a decrease in the ejection of blood from the heart, the cervical spine, which may affect the blood supply to the brain or abnormalities in the blood vessels of the brain, which may lead to a decrease in the blood supply to the brain cells and dizziness, especially when standing up, leading to further aggravation of dizziness. It is best to go to the hospital for blood pressure, especially ambulatory blood pressure, electrocardiogram, cardiac ultrasound, magnetic resonance examination of the cervical spine and cranial brain, etc., to effectively clarify the condition and then carry out targeted treatment.