Which symptom is associated with hypercapnia according to the material?

Which symptom is associated with hypercapnia according to the material?

• A. Headache
• B. Euphoria
• C. Nausea
• D. Passing out

Answer: (A)

Hypercapnia means there’s too much CO2 in the blood, usually from not breathing out enough or rebreathing. The brain’s blood vessels dilate in response to higher CO2 levels, which raises blood flow and intracranial pressure. That cerebral vasodilation tends to produce a headache, making it the most common early symptom you’d expect with elevated CO2. Nausea, dizziness, or confusion can occur as CO2 climbs, and passing out is a sign of more severe hypercapnia, but headache is the most consistent and characteristic sign among the options.

Hypercapnia means there’s too much CO2 in the blood, usually from not breathing out enough or rebreathing. The brain’s blood vessels dilate in response to higher CO2 levels, which raises blood flow and intracranial pressure. That cerebral vasodilation tends to produce a headache, making it the most common early symptom you’d expect with elevated CO2. Nausea, dizziness, or confusion can occur as CO2 climbs, and passing out is a sign of more severe hypercapnia, but headache is the most consistent and characteristic sign among the options.