What does it mean when your vision goes black?
Feb 27, 2023
Source: Cainiu Health
Dr. Cui Xin
Introduction
Anemia occurs due to reduced or insufficient red blood cell production, excessive red blood cell destruction, etc., leading to inadequate oxygen supply and tissue hypoxia. Orthostatic hypotension causes a decrease in blood returning to the heart when changing from a squatting or lying position to standing, resulting in reduced cardiac output. Hypoglycemia develops from decreased glucose levels in the plasma, causing insufficient nutrient supply to the brain.
Blackout or darkening of vision may be a sign of anemia, orthostatic hypotension, hypoglycemia, and other conditions.
1. Anemia
Anemia occurs due to reduced or insufficient red blood cell production, excessive red blood cell destruction, or other causes, leading to decreased oxygen-carrying capacity of the blood. This results in inadequate oxygen supply to tissues and consequently tissue hypoxia.
2. Orthostatic Hypotension
Orthostatic hypotension can be caused by factors such as physical weakness, dehydration, or blood loss. When changing from a squatting or lying position to standing, blood flows to the abdomen or limbs, reducing venous return to the heart. This leads to decreased cardiac output, causing symptoms such as visual darkening.
3. Hypoglycemia
Insufficient sugar intake, inadequate glucose production, or excessive consumption may all lead to decreased plasma glucose levels, resulting in hypoglycemia. This causes insufficient supply of nutrients to the brain, triggering symptoms.
In addition, this could also be a warning sign of diseases such as hypertension. It is recommended to visit a hospital for a comprehensive examination to determine the exact underlying cause.
