Definition
An abnormal increase in the rate or depth of breathing that flushes too much carbon dioxide from the blood, disturbing its chemical balance and causing symptoms such as dizziness, tingling in the fingers and toes, lightheadedness, visual disturbances, and eventually loss of consciousness if uncorrected.
Plain English
Breathing too fast or too deeply, which lowers the carbon dioxide in your blood and makes you feel dizzy, tingly, and unwell.
Context Anchor
Pilots encounter this term in aeromedical discussions, especially when learning about stress, anxiety, high-altitude flight, and symptoms that can look similar to lack of oxygen.
Derivation
From the Greek 'hyper' meaning 'over' or 'excessive,' and the Latin 'ventilare' meaning 'to fan' or 'to air out.' Literally 'over-breathing' — moving too much air through the lungs.
Why Pilots Care
Symptoms such as dizziness, tingling, and impaired judgment can appear suddenly and degrade aircraft control or decision-making.
Grounding Statement
A pilot under stress may start breathing too fast without noticing it, then feel worse even though there is still enough oxygen available.
Intuition Check
Hyperventilation does not simply mean being scared or panicked. It means breathing more than the body needs, which can happen during stress, anxiety, or high workload.
Example Sentence 1
After an unexpected go-around, the student began to hyperventilate, and the instructor coached him to slow his breathing before continuing the approach.
Example Sentence 2
The instructor reminded the pilot that hyperventilation can produce the same lightheaded feeling as hypoxia and should be ruled out first.