Why does the world go black when I stand up?
Oct 13, 2022
Source: Cainiu Health
Dr. Yang Jun
Introduction
In general, experiencing temporary dizziness or blurred vision when standing up may be caused by anemia, low blood sugar, or orthostatic hypotension. It is recommended to avoid prolonged squatting or sitting; rise slowly when getting up. If symptoms are severe, seek medical attention promptly. Additionally, engage in moderate physical activities such as walking or jogging in daily life, while avoiding intense exercise.
Generally, experiencing temporary vision darkening upon standing may be caused by anemia, hypoglycemia, or orthostatic hypotension.
1. Anemia: Anemia refers to a condition in which the hemoglobin level in the blood is below the normal range. When anemia occurs, low hemoglobin levels reduce the blood's oxygen-carrying capacity, leading to insufficient blood supply to the brain. This can result in symptoms such as dizziness and pallor. These symptoms, particularly dizziness, become more pronounced when changing posture from squatting to standing. It is recommended to actively improve nutritional intake to alleviate anemia symptoms.
2. Hypoglycemia: When blood glucose levels are too low, the body lacks sufficient energy, potentially causing temporary vision darkening. This may also be accompanied by symptoms such as excessive sweating and weakness. It commonly occurs in individuals with weak physical conditions or diabetic patients with unstable blood sugar levels. It is advisable to promptly replenish sugar.
3. Orthostatic Hypotension: Also known as postural hypotension, this condition occurs when a person suddenly stands up from a squatting, lying, or sitting position. Blood pools in the lower part of the body, preventing timely redistribution of blood circulation throughout the body. This can trigger orthostatic hypotension, leading to cerebral hypoxia and causing temporary vision darkening upon standing. It is recommended to avoid prolonged squatting or sitting, and to rise slowly. If symptoms are severe, prompt medical attention is necessary.
