Which of the following is a sign of oxygen toxicity?

Developing cough, chest pain, and difficulty breathing are indeed signs associated with oxygen toxicity. Oxygen toxicity occurs when there is an excessive amount of oxygen in the body, leading to harmful effects, particularly in the lungs and central nervous system. The high partial pressure of oxygen can cause oxidative stress, resulting in symptoms such as a cough, chest pain, and respiratory distress. These clinical manifestations can be a result of damage to the lung tissues and can indicate that the oxygen levels are too high, warranting a reduction in oxygen therapy or reevaluation of the treatment plan.

In contrast, other options such as frequent yawning, increased energy levels, and improved coloring of the skin do not correlate with the adverse effects related to oxygen toxicity. Yawning might indicate fatigue or a lack of oxygen (hypoxia), while increased energy levels and improved skin color are typically signs of effective oxygen therapy. Therefore, recognizing the signs of oxygen toxicity is crucial in the management of oxygen therapy to ensure patient safety and effectiveness of the treatment.