Which of the following is NOT a sign or symptom of oxygen toxicity?

Oxygen toxicity can occur when a diver breathes high-pressure oxygen, leading to a variety of signs and symptoms. Visual disturbances, euphoria, and dizziness are commonly associated with oxygen toxicity. For instance, visual disturbances can include changes in vision, such as tunnel vision or blurred sight, attributed to the effect of elevated oxygen levels on the central nervous system. Euphoria can arise as a neurological response to oxygen at higher pressures, sometimes leading to a false sense of security. Dizziness is also a reported symptom as a result of the high partial pressure of oxygen affecting the brain.

Headaches, however, are not typically a direct symptom of oxygen toxicity itself; while they can occur due to various reasons such as dehydration or other factors, they are not specifically linked to the toxic effects of oxygen at elevated pressures in the same way as the other symptoms listed. Understanding these distinctions is crucial for divers, as recognizing true symptoms of oxygen toxicity can assist in making timely and informed decisions to avoid serious health risks.