Which of the following is NOT listed as a subjective symptom of hypoxia?

• A. Air hunger
• B. Dizziness
• C. Headache
• D. Numbness

Answer: (C)

The key idea is telling signs the pilot feels versus signs others observe. Hypoxia produces several sensations that the airman perceives directly, such as air hunger (the sense of not getting enough air), dizziness, and numbness or tingling. These are classic subjective symptoms because they are felt and described by the person experiencing hypoxia.

Headache, while it can accompany hypoxia, is not listed as a subjective symptom in this particular material. It’s not something the pilot typically reports as part of the subjective symptom set in this context, even though it may occur. That’s why it’s the option that doesn’t fit the list of subjective symptoms.