If you experience tunnel vision and cyanosis you may have symptoms of

Explanation

PHAK Chapter 17 lists cyanosis (bluish fingernails and lips) and visual impairment such as tunnel vision among the symptoms of hypoxia, caused by too little oxygen reaching the tissues. Hyperventilation is a loss of carbon dioxide and typically brings tingling and dizziness rather than cyanosis, and carbon monoxide poisoning is usually associated with headache and, classically, a reddish rather than blue skin tone.