Stand up giddy at the moment blackness is how to return a responsibility

When standing up, dizziness and blackness in front of the eyes are usually caused by the gradual decrease of blood pressure in the body when the human body is in squatting posture and sitting posture. At this time, sudden change to standing posture will cause the blood pressure in the body to fail to recover in a short time, and symptoms such as brain hypoxia will occur, causing orthostatic hypotension.