What symptom involves feeling dizzy or light-headed due to a lack of oxygen?

• A. Nystagmus
• B. Dyspnea
• C. Hypoxia
• D. Barotrauma

Answer: (C)

The symptom that involves feeling dizzy or light-headed due to a lack of oxygen is hypoxia. Hypoxia occurs when there is insufficient oxygen available to the body or specific tissues, resulting in various physical and cognitive effects, including dizziness, confusion, or fainting. This condition can arise in diving scenarios where the diver ascends too quickly, resulting in less oxygen available in the bloodstream, or when the surrounding environment has a lower oxygen concentration.

Nystagmus refers to involuntary eye movements and is related to vestibular function issues, not directly to oxygen deficiency. Dyspnea is the difficulty or discomfort in breathing and is a symptom that can accompany hypoxia rather than specifically describe the sensation of dizziness. Barotrauma is an injury caused by pressure changes, typically affecting air-filled spaces in the body, and while it might lead to various symptoms including pain or discomfort, it is not specifically associated with feelings of light-headedness due to oxygen lack.