Definition
Difficult or labored breathing, often felt as shortness of breath or air hunger. In aviation medicine, it is a recognized symptom of decompression sickness, hypoxia, and other altitude-related conditions affecting the lungs or oxygen delivery.
Plain English
A feeling that you can't get enough air, or that breathing is taking real effort. It's the sensation of struggling to breathe, even when you're trying to breathe normally.
Context Anchor
Seen in altitude-related medical symptoms, including the FAA discussion of altitude-induced decompression sickness.
Derivation
From Greek 'dys-' meaning bad or difficult, and 'pnoe' meaning breathing. So literally 'bad breathing.' Knowing the 'dys-' prefix (as in dysfunction) helps lock in that this is breathing gone wrong, not just being out of breath from exertion.
Why Pilots Care
Recognizing dyspnea signals possible hypoxia or DCS, prompting immediate use of oxygen or descent.
Grounding Statement
A pilot with dyspnea may feel like they cannot get a full breath, even while sitting still and breathing deliberately.
Intuition Check
Dyspnea does not simply mean breathing fast. It means breathing feels difficult, uncomfortable, or insufficient.
Example Sentence 1
After a rapid climb to 18,000 feet, the pilot reported dyspnea and immediately descended to a lower altitude.
Example Sentence 2
Decompression sickness symptoms can include joint pain along with dyspnea.