Causes Of Orthostatic Intolerance

Inadequate Fluid And Salt Intake

The body must be properly hydrated for effective blood circulation and blood oxygen levels in the body. When the body is dehydrated, blood vessels constrict and limit blood flow throughout the body, which also causes blood pressure and heart rate to lower. This means the heart is pumping less blood to the organs, tissue, and muscles, and the body is receiving less oxygen. A decrease in oxygen or a decrease in blood pressure can cause many issues, including nausea, lightheadedness, and diminished cognitive ability.

Salt has been associated with cardiovascular issues, but in proper amounts, it is essential for good health. Those who drastically restrict their salt intake may experience an increase in hormones and lipids in the blood, disrupting the volume of blood plasma needed for proper body function and tissue health. When salt levels reach low points, blood pressure also drops, which can cause lightheadedness and fainting. If changes are made to one's diet, it is important to not have inadequate fluid and salt intake.

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Astronauts Returning From Space

Just as standing up quickly can cause dizziness and lightheadedness, gravity can have the same effect. When astronauts are returning from space, the blood rushes down their bodies as they reenter the atmosphere. This dramatic change in blood volume disrupts the amount of blood and oxygen reaching the brain and affects blood pressure, heart rate, and oxygen levels, resulting in lightheadedness. The physiological adjustments that occur due to changes in body posture and atmosphere cause issues with spatial awareness and within the cardiovascular and respiratory systems. The body undergoes pressure with these changes and must adapt to significant adjustments necessary for organ function.

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