Which symptom is associated with hyperventilation?

• A. Tingling
• B. Fainting
• C. Sweating
• D. Cough

Answer: (A)

When you hyperventilate, you blow off carbon dioxide faster than it’s produced, leading to respiratory alkalosis. This higher pH makes nerves more excitable and reduces ionized calcium, causing tingling and numbness around the mouth and in the fingers and toes. That tingling is the symptom most closely linked to hyperventilation. Fainting can occur in more extreme cases due to reduced cerebral blood flow, but it’s not the typical early sign, while sweating and coughing are not specific features of hyperventilation.