Definition

a state of carbon dioxide deficiency caused by an excessive breathing rate due to stress, fear, anxiety in flight. 

Symptoms

• Visual impairment 
• Unconsciousness 
• Light-headed or dizzy sensation 
• Tingling sensation 
• Hot and clod sensation 
• Muscle spasms 

Treatment 

• descend to a lower altitude or use supplemental oxygen first because the symptoms of hypoxia and hyperventilation are similar 
• breathing into a paper bag, breathing normally, talking aloud
• land at the nearest airport and seek medical help 

Common symptoms of hypoxia and hyperventilation

• drowsiness
• headache
• visual impairment
• unconsciousness